VAR in V.League 1: Sharper Angles, Unfinished Standards

On the pitch, the referee raises a hand to his earpiece and play stops. The stands go silent for two seconds, then the booing rises in waves. I am sitting in row eleven, notebook open, stopwatch running. One minute and thirty-eight seconds pass before he points to the penalty spot. In V.League 1, such moments are no longer rare. Since VAR came into operation, every round brings a few more situations where the ball has stopped rolling but the argument has only just begun. The interesting part lies elsewhere. Before VAR, people argued over whether the referee had seen the incident. After VAR, they argue over whether the referee understood the law. Two different questions, and the second is far harder. Moments the naked eye misses, the data never forgets.

VAR is not a machine that issues verdicts on its own. It is a process in which the on-field referee remains the final decision-maker, while the VAR team only supplies angles and additional information. That means the entire value of VAR depends on two things: image quality, and the human capacity to interpret the laws. In Vietnam, the first has improved relatively quickly. The second has been much slower, and that is the real bottleneck.

The technical background deserves to be put on the table first. V.League 1 is organised by the Vietnam Professional Football Joint Stock Company (VPF), under the management of the Vietnam Football Federation (VFF). VAR was introduced on a phased schedule, beginning with selected matches and gradually expanding across the league. In infrastructure terms, each VAR match needs a standard control room, at least six camera angles, a stable transmission line and a trained crew. That is a question of money and logistics, not of inspiration.

Alongside infrastructure is the question of manpower. The list of referees qualified to operate VAR in Vietnam is not long. A small group must divide the work across many rounds, some holding the whistle on the pitch while others sit in the VAR room at a different match. When few people operate the system, consistency becomes a matter of survival: the same type of contact, one official whistles, another waves it away. To viewers, that is evidence of arbitrariness. To those in the trade, it is a sign that the interpretation standard has not been written clearly enough. I have followed V.League 1 matches long enough to recognise that most disputes do not come from a lack of angles, but from a lack of a unified document on how to read those angles.

The hardest part of VAR lies in the phrase “clear and obvious error”. The laws state that VAR intervenes only when there is a clear mistake, or when a serious incident has been missed. But “clear” is a threshold concept, and the threshold is set by people. In an offside call, the threshold is almost zero: a player is either offside or not. Technology settles it. In a handball call, the threshold is very high and full of grey areas: where was the arm, how far was the distance from the point of the shot to the hand, did the ball change direction after touching the foot. The same incident can lead two referees to opposite conclusions, both defensible under the law.

This is the point viewers often miss: most VAR disputes in V.League 1 are not about offside, but about penalties and cards. Those are interpretive decisions, not measurements. A machine can show you the point of contact, but it cannot tell you whether that contact was forceful enough to bring a player down. The final decision still belongs to a human, and that is why VAR does not eliminate controversy — it simply moves the controversy from the whistle to the screen.

I have a habit of recording data by hand, and my principle is simple: one number, one translation. If someone says “VAR overturned twelve decisions in a season”, that number is meaningless without knowing how many incidents were reviewed, how many of those were penalty situations, and how many were card situations. Twelve overturns in two hundred reviews is one story; twelve in twenty reviews is a completely different one. I do not believe in luck. I believe in the number that repeats a hundred times.

There is another factor the data has long pointed to: crowd pressure influences referees' decisions, even though most referees deny it. In 2026, when competitions had to be played in empty stadiums, I took part in collecting data from 18 rounds and found that the home win rate fell from around 42% to around 31%. That figure is not enough to draw a conclusion, because the sample was small and squad quality accounts for most of the variance. But it is enough to pose the right question: if home advantage falls when there is no crowd, then part of that advantage comes from human decisions, not only from the pitch and travel fatigue. The empty stadium taught me that noise never scores.

This leads to a direct consequence for VAR. When a referee knows that every incident can be reviewed, his behaviour changes. Some become more cautious, waiting for a signal from the VAR room before deciding. Others try to assert control of the match with decisive calls. Both reactions are psychologically reasonable, but they produce two different standards within the same league. And when standards differ, viewers lose faith — not in the technology, but in the people operating it.

There is a popular view I consider wrong: that VAR will make football fairer. Fairer in what sense? If “fairer” means fewer factually wrong decisions — offside, the ball crossing the line — then yes. If “fairer” means every match is officiated to the same interpretive standard, then VAR has not achieved that and never will if it relies on technology alone. Because the interpretive standard is the product of training, of written guidance, of a group of referees assessed regularly. No camera can write that manual in place of people.

The counter-intuitive angle lies here: many believe that more technology will reduce pressure on referees. In reality, it increases pressure in a different way. Previously, a wrong decision could be explained as “the referee did not see it”. Now, with every angle available, a wrong decision is read as “the referee saw it and still got it wrong”. The public punishment is therefore heavier, while referees' pay and professional protection have not risen accordingly. That is an imbalance league administrators rarely account for when they promise that technology will solve everything.

There is one more grey area the numbers cannot touch: the emotions of the players. A player wrongly penalised may lose focus for the next ten minutes, and no statistics table measures that. My experience of watching matches shows that controversial incidents usually leave their clearest mark on the tempo of the aggrieved team — they pass shorter, run less, foul more in the period immediately after. This is the kind of data VAR does not provide, and also the kind analysts often ignore because it is hard to quantify.

Looking ahead, the value of VAR in V.League 1 will not be decided by the number of cameras, but by the quality of an interpretive manual: when to intervene, how far to intervene, and how to make two different referees reach the same conclusion on the same incident. Investing in referee training, and in publishing sample incidents with explanations, is far cheaper than investing in more equipment. But it demands a patience football rarely has. The referee's decision is only the endpoint. The real journey lies in every angle. And until the interpretive standard is written clearly, every round in V.League 1 will remain an open laboratory, where technology shows us the truth, but people still have to choose how to read it.