VAR in V.League: When the Review Room Needs a Checklist, Not Just a Screen

I sat down and re-watched a single passage of play from the most recent round of V.League no fewer than twenty times. An away defender tugged lightly at the home striker's shirt inside the penalty area. The referee did not whistle. VAR reviewed the incident, examined four camera angles, and upheld the decision. The stands called it "useless VAR." But when I reconstructed the review team's decision log, the problem sat somewhere else entirely: V.League's VAR system was installed correctly, yet the decision-making process inside it had never been standardized. The same passage of play can produce two opposite conclusions from two different VAR teams — and both believe they are right.

Across more than forty years of watching football, I learned one thing from my own mistakes: technology does not manufacture consistency by itself. In 2026, while working as a VAR assistant at San Siro, I hesitated over a 0.2-metre offside by Higuaín because I was afraid of being wrong. Milan lost 0-2, and the referee supervisor criticized me in front of the whole team. What I lacked was not a screen, but a set of criteria to turn observation into a decision. I spent a month re-watching 47 similar passages and built a 37-point checklist. That lesson applies directly to V.League: a VAR system is only as strong as the standardized process behind it, not the number of cameras in the stadium.

Vietnamese fans live with that reality every round. Since VAR was introduced in V.League, each matchday has produced at least one controversy. One round, a goal was disallowed for an offside measured in centimetres. Another round, a clear penalty was waved away. The striking detail lies in the fact that the controversies are not of the same type. When one category of error is handled three different ways across three rounds, the problem is no longer the referee's eyes, but the standard of the entire system.

The core point sits here: V.League imported the technology, but not the methodology that comes with it. The essence of VAR is a protocol, and the IFAB protocol sets three mandatory questions before any intervention: does the incident fall within the four reviewable categories (goals, penalties, direct red cards, mistaken identity); is the referee's original decision a "clear and obvious error"; and does intervention improve accuracy without destroying the flow of the match. Those three questions sound simple, but they demand something V.League currently lacks: a shared language between VAR teams.

Watching V.League matches this season, three types of controversy emerge, each needing its own diagnosis. The first is a threshold error: offside or handball passages that differ by a few centimetres, where cameras and virtual lines decide the outcome. The second is an interpretation error: the same contact, judged a foul by one and a fair challenge by another. The third is a process error: a VAR team reviews the correct incident but reaches the wrong conclusion for lack of a unified checklist. The first two are technical problems, fixable with better technology. The third is a problem of people and systems — and it accounts for most of the controversies I recorded.

I do not trust my eyes; I trust slow motion. But slow motion can deceive the viewer too, if it is presented without context. A close angle shows a hand touching the ball; a wide angle shows that hand in a natural position as the body rotates with the running stride. Both are true, but only one fits the law on "an unnatural position that makes the body unnaturally bigger." If a VAR team is not trained to select the right angle according to the right law, technology only amplifies error instead of correcting it.

This is where I have to look at the submerged part of the iceberg. VAR in V.League is expensive. Installing a system at an internationally compliant stadium, plus per-match operating costs, plus referee training, is an investment most V.League clubs cannot carry alone. When a league spends on technology but not proportionally on human training, it creates a skewed structure: modern screens, but operators still working on instinct. I have seen this pattern in many places. It always ends the same way — the public loses faith in the very thing built to strengthen that faith.

Referee training is where the gap shows most clearly. A VAR-certified referee needs hundreds of hours on simulation systems, plus periodic assessment based on data rather than a supervisor's impression. In top European leagues, every VAR decision is logged as a file, and that file is analysed monthly to find systemic blind spots. In V.League, no comparable public mechanism exists. Without feedback data, a referee cannot know where he is wrong — and the system cannot know where it is drifting.

Every ruling needs a review, including the ruling of data. I say this because I once believed that enough data was enough to be right. Data only answers what it is asked. If the question is wrong, the data remains honestly "correct" and still leads to a wrong conclusion. That is why a good checklist matters more than a good algorithm: a checklist forces the decision-maker to state what is being checked, by which standard, and why.

The irony is that Vietnamese fans do not oppose VAR. They oppose inconsistency. When a decision is made on a clear standard, even against the team they love, most accept it, because they understand the logic behind it. Conversely, when two identical passages receive two different rulings, trust collapses faster than any single mistake could cause. Football is a game of errors, but the winner is the one who knows which errors are worth making. In VAR, the error worth making is the explainable one; the unexplainable error is the one that destroys the system.

Now to the counter-intuitive part. The most common explanation for VAR controversies in V.League is to blame the referees — their competence, their attitude, their "weak mentality." I do not buy that explanation, and I say this as someone who once stood inside the review room. When a VAR team reaches a wrong decision, the cause almost always lies in the structure, not the individual. A referee working without a checklist, without data feedback, without a shared standard among colleagues — his mistake is not his fault; it is the fault of a system that placed him there. Blaming individuals is the easiest escape, and the most useless one.

The second view is harder to hear: fan emotion is being used as a measure of justice, and that harms the fans themselves. When a decision sparks controversy, pressure from the stands and the media can force organizers to explain, apologize, even change how things operate. But if those changes are driven by noise rather than data, they produce an even more inconsistent system. A referee who fears the stands will not decide by the law; he will decide by whichever call provokes the least reaction. That is a complete inversion of sporting justice.

Technology did not kill football; it killed blind faith. But technology does not save faith on its own either. If V.League wants VAR to genuinely work, the next step is not buying more cameras, but making the process public: a standard checklist for every VAR team, a decision database for every ruling, and periodic feedback built on data rather than feeling. Do that, and controversy will not vanish, but it will shift from "is VAR biased" to "is this process correct" — and that is the argument a mature football nation needs to have. Before blowing the whistle, I review myself. V.League should also start reviewing itself, not to find fault, but to find a standard.