VAR in V.League 1: Why Cards Went Up While Controversy Refused to Go Down

Minute 68 of a V.League 1 match. The score stood at 1-0 to the home side. The away team put the ball in the net, the stands erupted, players sprinted to the corner flag to celebrate. Then the whistle cut across. The referee put two fingers to his earpiece, turned, and drew a rectangle in the air. Review.

Four minutes later he walked away from the monitor, went straight to the penalty spot, and showed a yellow card to the home goalkeeper. There was no goal. There was a penalty for the away side, and a yellow card nobody on the pitch understood immediately. The stands shifted from roaring to whistling inside ten seconds. The home coach stood at the edge of the technical area, both hands in his pockets, saying nothing.

Those four minutes are the longest passage of time in football. No ball rolling, nobody running, nobody shooting. Just twenty-two players scattered across the grass, one referee staring at a screen, and forty thousand people in the stands writing their own verdicts.

I have watched that footage back eleven times. Not to determine whether the decision was right or wrong. But to see who stood where, who raised a hand first, who turned away, and how many seconds it took the referee to move from observing to adjudicating. People watch players run; I watch when they stop. I do not believe in luck; I believe in slow-motion replay.

Vietnam is not the first country in Asia to bring VAR into its national league, and it will not be the last. But the way it arrived deserves to be written down as a record.

From the 2026 season, VAR began operating in a number of V.League 1 matches, with technical support and training from FIFA and the AFC. In the seasons that followed, the number of VAR-enabled fixtures rose steadily, dragging behind it a chain of infrastructure demands that are far from trivial: the number of cameras per match, redundant transmission lines, a video operations room, internal communication systems, and above all the number of referees certified to operate the technology. A league cannot have VAR simply because it has bought the equipment. It has VAR when it has enough trained people to sit behind the screen without panicking.

This is the point where many Southeast Asian leagues stumble. The VPF and the VFF can spend money on a system, but they cannot spend money to buy experience. Experience only arrives through matches. And matches only arrive when there are enough compliant stadiums, enough VAR crews, and enough of a calendar to rotate them.

In Spain, where I work every day, VAR has been through enough cycles that people no longer argue about whether it should exist, but about how it should be used. Yet La Liga has eighteen cameras per match at key rounds, semi-automated offside line technology, and a dedicated refereeing committee with a mechanism for publishing audio of the conversations after each round. Those are three different layers of the same problem, and V.League 1 currently stands on the first.

Based on my experience covering matches in both football cultures, I always ask three questions before judging whether a league has genuinely mastered VAR. How many camera angles are used for offside situations? Is the offside line drawn by machine or by eye? And are referees rotated randomly enough that nobody can predict who will take charge of which fixture?

All three questions share one logic: VAR does not eliminate error, it changes the type of error. Before VAR, the error sat in the human eye on the pitch. After VAR, the error sits in the choice of frame, the choice of moment, and the interpretation of an image that is nowhere near as neutral as people assume.

That is why I started keeping the ledger.

---

Over the past two seasons, the average number of yellow cards per match in V.League 1 has hovered around four. I take that figure from match reports published by the organisers and cross-check it against two separate broadcast sources, because numbers do not lie, but the people who record them can. There are matches where the report lists three cards while the footage shows four cautionable acts, only one of which went unrecorded.

The rise in yellow cards after VAR arrived is technically straightforward, and it does not mean Vietnamese players have become dirtier. There are three very concrete causes.

First, when every collision in the box gets rewound, acts that the on-field referee missed because he could not see them appear before a different pair of eyes. An arm pulling a shirt for three-tenths of a second is virtually invisible from the main angle. From behind the goal, it is an unmistakable act. Same passage of play, two different conclusions, and the referee is forced to choose the conclusion with visual evidence behind it.

Second, stoppage time has increased. When a half stretches five or six minutes longer, the number of incidents inside that window rises with it. Players are more tired, reactions are slower, fouls are more frequent. This is a knock-on effect that very few people put into their spreadsheets.

Third, and this is the point I care about most: cards for dissent have risen. When a decision is overturned after four minutes, players stand there for those four minutes. Four minutes is more than enough for adrenaline to rise, for the captain to go and question the referee, for the goalkeeper to clap repeatedly, for a young player to say something he will regret. Then the whistle goes, and the referee has to produce a card to reclaim control of a match he lost during those four minutes.

In other words, VAR did not create controversy. It stretched controversy into a measurable span of time, and inside that span, human beings behave like human beings.

I once made a mistake at exactly this point. In the summer of 2026, early in my career as a disciplinary reporter, I was assigned to a friendly between Real Madrid and Barcelona in Miami. I recorded Sergio Ramos as having received two yellow cards when in fact he received one. One small detail wrong, the entire match report wrong. I spent two weeks in the office rewinding footage and cross-checking forty-seven foul incidents from that single game.

Since then, every disciplinary figure I publish passes through at least two independent broadcast sources. Once again: numbers do not lie, but the people who record them can.

---

The number of penalties awarded in V.League 1 during VAR seasons is higher than in the season before, and I would argue most of that increase comes from box collisions that referees previously waved away because they lacked the confidence to give them. This is a fascinating behavioural shift. Referees did not become stricter. They became less lonely.

In a league where a referee answers to forty thousand spectators and to the organisers' assessment, having a second voice in the earpiece changes how he decides. Not because that voice is more correct, but because the decision is no longer his alone. Responsibility is shared, and shared responsibility is always more comfortable than responsibility carried alone.

There is, however, another metric I track that receives far less attention: how often the on-field referee upholds his original decision after reviewing the monitor. This is the metric that actually measures competence. A good VAR crew must be able to tell the referee: your call was right, come and confirm it. A poor VAR crew has only one function: call the referee over to overturn.

In V.League 1, the uphold rate after review remains low. That means when a referee walks away from the monitor, the odds are he will change his mind. A VAR crew should only intervene for clear and obvious errors, in line with the minimum-intervention principle IFAB sets for competitions using VAR. If nine out of ten reviews end in an overturn, the problem lies with the person making the call, not the person refereeing the match.

---

In 2026, when the pandemic suspended leagues worldwide and then brought them back behind closed doors, I was asked to write about football's future. Colleagues rushed to write about the atmosphere of empty stadiums. I sat down and built a spreadsheet of two hundred and fourteen matches played after La Liga returned in June, analysing the effect of absent crowds on card counts and refereeing decisions.

The result showed yellow cards fell by roughly twelve per cent against the previous season. The piece travelled widely when published, not because it concluded anything grand, but because it asked a question nobody had asked: if crowds influence yellow card counts, in what way are crowds influencing referees?

With no spectators present, the referee still has to keep his eyes wide open. But he keeps them open differently. Without the roar of the stand behind his back, without the pressure of forty thousand people looking the same way, a referee returns to something closer to the essence of the job: observing behaviour, rather than managing the emotional temperature of a crowd.

That is the clearest experimental evidence for something people in the profession say to each other but rarely write down. A refereeing decision is not merely the product of what happens on the pitch. It is the product of what happens on the pitch plus what is happening inside the referee's head about the social consequences of that decision.

V.League 1 went through a similar phase in the 2026 season, when several rounds were played under crowd restrictions. I compared match reports from that period with the periods before and after. Average yellow cards fell slightly, but cards for dissent fell far more sharply. Players did not protest because there was nobody to protest with.

That is one of those victories nobody notices. In football, there are victories nobody notices.

---

This is where I want to turn, and it may irritate some readers.

The entire public debate about refereeing in Vietnam revolves around a single question: was the decision right or wrong. That is the wrong question. It is the easy question, because it has a binary answer, and because it lets all of us keep our positions without having to think any further.

The right question is: which system produced that decision, and is that system correcting itself.

A referee making one error in one match says little. A referee making the same type of error across four consecutive matches says a great deal, and what it says is not about that person's character. It says nobody sat down and cross-referenced those four matches before assigning the fifth.

In La Liga, the refereeing committee runs an internal, incident-by-incident assessment system, and referees are demoted to lower divisions when their assessment scores fall short. What matters is that the system still generates fierce controversy, but it exists, it has criteria, and it has consequences. A referee knows that three poor rounds in a row means officiating in the second tier next week. That pressure is entirely different from the pressure of public criticism.

In Vietnam, the problem is not the ability of the FIFA-badged referees working in V.League 1. Anyone assigned to continental competitions has passed rigorous AFC examinations, including fitness tests and English tests. The problem is that post-match assessment is not published, so nobody can verify whether it is functioning. When a process is not published, it does not merely lose transparency. It loses the capacity to self-correct, because nobody outside has enough data to point out that it is going wrong.

This is the biggest blind spot of VAR in Southeast Asia generally and in Vietnam specifically. People invest in hardware and forget that the software of VAR is human.

There is another paradox I have observed across many seasons. The more technology is deployed, the more audiences expect perfection. And the more perfection is expected, the higher the outrage when an error occurs, even when that error is far smaller than the errors people once accepted in silence a decade ago. Technology does not soothe controversy. It raises the standard of controversy.

Beyond that, a yellow card is not a behaviour. The card is a record. Discipline lives in the behaviour; the card is merely how we count it. When an entire football culture argues about card counts, it is arguing about the counting system, not about the behaviour. To change behaviour you have to intervene in a player's decision chain, and that chain begins with the player believing the referee will be consistent.

The chaos of the match is the surface; beneath it lies the logic of numbers. And the clearest pattern in my data is this: teams that react to an adverse decision within the first five seconds receive more yellow cards across a season than teams that keep their captain as the sole point of dialogue.

---

There is one more variable that I consider more serious than every VAR argument combined, and it barely appears in discussions about refereeing.

Fixture density.

A match lasts ninety minutes, but discipline lasts a whole season. And discipline erodes fastest not because of referees, but because of the calendar.

When a club plays twice a week for six consecutive weeks, three things change at once. First, fouls increase, because players arrive half a step later than usual. Second, cards for tactical fouls increase, because players are forced to foul in order to compensate for failing to get back. Third, injuries increase, and injuries are what reshape league tables.

I have seen this in my own data across multiple seasons. No medical department can save you from two matches a week. There are clubs with the best medical staff in the league, the best recovery rooms, the best load-monitoring equipment, and they still lose a key player in the decisive round. Sports medicine has limits, and its limit is time.

Vietnam has a painful illustration of this. In January 2026, in the second leg of a regional final, Nguyen Xuan Son suffered fractures to his tibia and fibula after a first-half collision. The naturalised forward was in the best form of his career, had scored in the first leg, and the injury arrived precisely when he was being used most heavily in the shortest possible window.

That was not a random accident. It was the end of a chain. That chain begins with the calendar, passes through minutes played, passes through the gaps between matches, and ends in a hospital.

Players like Nguyen Quang Hai, Nguyen Hoang Duc, Do Hung Dung and Nguyen Tien Linh have all gone through periods of fixture congestion that no European training ground would dare impose on its own squad. And when those key players are lost, the quality of the league goes with them, and when the quality goes, refereeing controversy becomes the only thing left to talk about.

This is the connection few people make. A low-quality match produces more collisions in the box, because players are slower and more passive. More collisions mean more VAR interventions. More interventions mean more controversy. In the end, people blame the referee for a problem that began with the organisers stacking the calendar.

---

So what should be tracked next season?

I propose four indicators, and I believe all four can be collected without an expensive data platform.

One: the rate at which the on-field referee upholds his original decision after a monitor review. This indicator measures the quality of the VAR crew, not the referee. If the rate is low, the problem sits with the person behind the screen.

Two: yellow cards for dissent, separated from total yellow cards. This measures a team's emotional discipline, and it predicts late-season points dropped far better than total cards do.

Three: average stoppage time, split by referee rather than by league. This is the most easily misread and yet the most useful indicator, because it reveals each official's game-management style.

Four: the gap between a player's matches, measured in hours rather than days. No club has ever won a title by grinding down its key players, but plenty have been relegated by doing exactly that.

Alongside those four indicators, there are three concrete proposals I believe are cost-feasible and clearly impactful.

First, publish the audio of conversations between the on-field referee and the VAR crew in intervention situations. Not the whole match, only the reviewed incidents. This has been adopted in several leagues and always produces two effects: audiences understand the limits of the technology, and referees are forced to articulate their reasoning.

Second, maintain a public disciplinary ledger per referee, updated after each round, listing matches officiated, reviews triggered, overturns, and stoppage time. No evaluation required. Just the data. The public is capable of reading data when the data is put in the right place.

Third, assign referees by algorithm rather than by gut feel, to reduce both real pressure and the perception of pressure. A very large share of refereeing controversy in Southeast Asian leagues does not stem from wrong decisions, but from the same official appearing in too many important matches involving the same club.

---

I record things more slowly than my colleagues, but my mistakes have an expiry date. That is why I still sit down after every match, rewind the footage, and write out each minute.

Next season, when a V.League 1 referee stands at the monitor and takes four minutes to reach a decision, I will not be counting those four minutes. I will be counting how many players left their positions during them, how many walked towards the referee, and how many stayed where they were. A team's discipline is not found in the final card. It is found in the men who do not step forward.

And if another season passes without the uphold rate after monitor reviews moving at all, we will have to accept something simple: the problem was never the eye in the sky. The problem is the person sitting behind it, and the system that trained that person in the first place. A football culture can buy technology in a single summer. Making that technology part of its decision-making culture takes far more seasons than that — and it requires a much harder decision: publishing its own referee assessment process.