VAR in V.League: The “Clear and Obvious Error” Threshold and the Referee's Consistency Problem

Since VAR came into operation in V.League 1 from the 2026 season, one image has become familiar to Vietnamese spectators: the centre referee leaves the middle of the pitch, walks towards the touchline where a monitor is set up, places a hand on his ear to speak with the VAR assistant, then draws a rectangle in the air. The stands fall silent for a few seconds, then cheers and jeers blend together. No one in the stadium knows exactly what is happening in the referee's earpiece, and no one knows what he is weighing up. Most spectators only see the final outcome: a raised arm, a decision overturned, or a decision upheld.

For years, refereeing controversy in V.League revolved around situations the human eye could not keep up with: a collision in the penalty area hidden from view, a goal scored from an offside position by a few dozen centimetres, a red card shown on the basis of a feeling about how dangerous a challenge was. The pressure on the officiating team is enormous, because every decision is dissected across media and social networks for days afterwards. The Referees Committee of the Vietnam Football Federation (VFF) has repeatedly had to speak out to explain controversial situations, and has more than once had to handle internal discipline for referees who made serious errors.

VAR arrived as a promise of accuracy. But its limits must be understood clearly. Under the Laws of the Game issued by the International Football Association Board (IFAB), VAR may only intervene in four categories of situation: goal or no goal, penalty or no penalty, direct red card, and mistaken identity. VAR was written into the Laws of the Game in 2026, after FIFA approved its use at the 2026 World Cup in Russia. Outside those four categories, VAR has no right to intervene, no matter how controversial the situation.

Deploying VAR in a professional league requires far more than a screen. It needs a standards-compliant camera system, a control room, data transmission lines, and — most importantly — a team of referees trained and certified to operate it. This is why bringing VAR into V.League took years of preparation, and why every match with VAR consumes far more resources than a match without it.

At continental level, the Asian Football Confederation (AFC) also sets its own requirements for refereeing standards and VAR operation, obliging national leagues that wish to integrate to invest in a coordinated way. A referee who wants to operate VAR at international level must go through strict training and assessment, both in the theory of the laws and in the skill of operating the equipment.

The crux of the whole system lies in the intervention threshold. IFAB stipulates that VAR may only recommend a review when there is a “clear and obvious error” or a “serious missed incident”. This is a qualitative standard, not a number. There is no measure of how forceful a collision must be to justify overturning a penalty decision. Two referees watching the same clip can reach two different conclusions, and both can argue their case using exactly the same set of laws.

I once spent hours analysing the VAR decisions at the 2026 World Cup, when the technology first appeared at a World Cup. In the France–Australia match, Antoine Griezmann's opening goal from the penalty spot was only awarded after VAR reviewed Joshua Risdon's challenge. I reconstructed every camera angle, measured foot speed and the angle of contact, trying to find an objective threshold. The conclusion: that threshold does not exist as a number; it exists as an agreement between people. And agreements can shift between matches, between referees, between competitions.

In V.League, VAR's operating structure consists of a centre referee, a VAR assistant (AVAR) and a replay operator. The process runs in two stages. The first is the “check”: the VAR assistant silently reviews every situation in the four intervention categories, without needing to notify the centre referee. The second is the “review”: only when the VAR assistant judges that there is a clear and obvious error is the centre referee invited to the monitor. The boundary between these two stages is where every controversy begins, because the decision of whether to invite a review is itself a decision.

One detail that receives little attention: for objective situations such as offside or whether the ball has gone out of play, VAR is essentially confirming data. But for subjective situations — how forceful a collision was, the direction of the ball in a handball incident, how dangerous a challenge was — VAR only supplies extra angles, while the judgement remains with the centre referee. In other words, technology resolves the “right or wrong” part of an event, but not the “serious or minor” part of intent.

The overarching philosophy of VAR is summed up by IFAB in one principle: minimum interference, maximum benefit. This means VAR must not turn every passage of play into an investigation. The referee must still keep the tempo of the match, still manage the emotions of both sets of players, and still be responsible for what happens after the whistle. A review lasting three minutes can completely break the rhythm of a game, cool down a match that was heating up, and create a silence in which neither the stands nor the players know what to do. Managing a match while waiting for VAR is a skill in itself, and not every referee is fully trained for it.

The principle that “the on-field decision stands” (referee's call) is the pillar of the whole system. The centre referee remains the final decision-maker. The VAR assistant cannot make him change his mind, only recommend. This design protects the referee's authority on the pitch, but it also pushes responsibility back onto him. When a decision is overturned, people do not remember the VAR assistant who recommended the review; they remember the referee who raised his arm. VAR does not fix mistakes, it only changes who carries the responsibility.

This is why I always repeat one professional principle: the referee is the only person on the pitch not permitted to be led by emotion. Players are allowed to be angry, coaches are allowed to react, spectators are allowed to jeer. The referee is not. He must separate the crowd's reaction from the facts in front of him, and that is the hardest job on the pitch, harder than running a full 90 minutes.

From a data perspective, a repeating pattern is visible. Most VAR checks do not lead to a changed decision. The small number of overturned situations tends to cluster in two groups: penalties and red cards. This reflects a reality: these are the two types of decision with the greatest influence on the result of a match, and therefore the place where errors carry the heaviest consequences. In a league where the points gap between the leading teams is often very small, a missed penalty or a wrongly shown red card can decide an entire season.

There is another limit VAR cannot cross: it does not handle yellow cards. A dangerous challenge that does not reach the level of a direct red card falls outside the technology's reach, even if it may deserve punishment. This is the gap that the VFF Disciplinary Committee can fill after the match, by reviewing footage and imposing additional sanctions. This retrospective punishment mechanism is an important part of the disciplinary process, because it compensates for what VAR misses in real time.

Based on my experience following matches, most controversy in V.League lies not in what the referee saw, but in how he interpreted what he saw. The same collision, one referee may treat as a penalty, another may treat as a forward going down on his own. Both have grounds. The problem lies with people and process, not with technology.

Spectators see the situation, the referee sees the moment, I see the whole process. And the process in V.League still has gaps. One of them is the question of audio. In some leagues around the world, the conversation between the centre referee and the VAR assistant is released after the match, helping spectators understand why a decision was made. In V.League, these exchanges are not made public. Spectators see only the images, not the reasoning. That information gap is fertile ground for suspicion.

There is a paradox few are willing to admit: VAR does not reduce controversy, it merely shifts controversy to another layer. Previously, people argued about the referee's decision on the pitch. Now, people argue about whether the referee should have gone to the monitor, about whether he chose the right frame, about why a similar incident in a previous match was handled differently. The object of the argument changes; the level of controversy does not fall.

The biggest blind spot of this approach is the habit of judging process by outcome. A decision correct under the laws but unfavourable to the team a spectator loves will be treated as wrong. A decision wrong under the laws but favourable to that team will be treated as reasonable. The emotions of spectators and the correctness of the laws are two different frames of reference, and we often blend them together. The referee has no right to blend them that way. His task is to apply the same measure to every team, in every match, whichever way the result leans.

Here a question of process emerges, not of individuals: who has the authority to set and adjust the intervention threshold for an entire season? If each officiating team interprets the “clear and obvious error” threshold in its own way, then consistency — the very thing VAR was expected to deliver — disappears. Consistency does not mean every referee must make identical decisions in identical situations; that is impossible. Consistency means the same process, the same way of framing the question, the same degree of rigour in verifying before concluding.

The laws never stand outside the match; they are a second match running in parallel. In that second match there are no spectators, no cheering, only people trying to apply a text of law to living and ambiguous situations. That is work no technology can fully replace, because technology only sees images, while only people understand intent.

The way forward does not lie in adding more cameras or widening the scope of VAR intervention. It lies in making the process transparent: releasing the conversations, explaining the reasoning behind each decision, and building a referee-training system based on consistency rather than reaction. Semi-automated offside technology, used at the 2026 World Cup, may be the next step, but it only addresses a small part of the problem. If VAR is to genuinely change Vietnamese football, it must start from the hardest place — the place no one sees: the silence between the moment an incident occurs and the moment a decision is made. Football has no VAR, only blind spots waiting to be exposed.