Vietnamese Football's Data Void: When VAR Still Cannot Answer the Old Question

Vietnamese Football's Data Void: When VAR Still Cannot Answer the Old Question

On the night of January 5, 2026, at Rajamangala Stadium in Bangkok, the final whistle of the second leg of the ASEAN Mitsubishi Electric Cup blew with the two-legged tie closing at 5-3 in Vietnam's favor. It was a night to remember. Nguyen Xuan Son scored and then suffered a serious injury, hundreds of thousands of fans poured into the streets, and the whole country spoke of a new golden generation. But there was a detail almost nobody kept: after the match, not a single official document explained why certain penalty-area situations had been handled the way they were.

I took notes on every minute of that match, not to judge right or wrong. I kept them for a different reason: by the final minute, I still could not answer one very simple question — which standard had been applied to the first incident, and which to the second, when both involved a handball in the box and both ended with the decision upheld? The answer, after years in this profession, I already knew: nobody gives one. Not because it is hidden, but because no system records it.

That is the void I want to address here. Not the void of a wrong decision, but the void of data — the thing Vietnamese football lacks, while its fans demand ever more.

Context: Three years of VAR and a belief never tested

VAR was introduced to V.League 1 from the 2026 season, after the Vietnam Football Federation (VFF) and the Vietnam Professional Football Joint Stock Company (VPF), working with FIFA and the Asian Football Confederation (AFC), deployed referee training and equipment. It was a major turning point for domestic football: Vietnam was among the earlier Southeast Asian leagues to run referee-assistance technology on a regular basis.

Technically, VAR in Vietnam follows the IFAB framework exactly (the International Football Association Board, the body that writes the Laws of the Game). VAR can intervene only in four categories: goals, penalty decisions, direct red cards, and mistaken identity. The central principle is a "clear and obvious error" or a "serious missed incident." If the error does not meet that threshold, the on-field decision stands, even when it is contentious.

That sounds clear. But the very threshold of "clear and obvious" is where everything begins to blur. It is not a number. It is not a measurement. It is a judgment — and judgments need data to be verified, while the data does not exist.

I have followed Vietnamese football and international competitions for many years, and what I recognized early is this: Vietnamese fans understand the laws faster than domestic media usually assumes. After every matchday, forums, groups and analysis pages fill with specific questions: "What position was the arm in?", "Does that count as a natural silhouette?", "Why didn't the referee go to the monitor?" These are not emotional questions. They are technical questions, and we are not answering them with technical answers.

The machine does not blow the whistle

The first thing to state clearly, because it is the most misunderstood: VAR does not make decisions. VAR is not a willful entity. It is a process of people and equipment, in which people — the VAR team — remain central. The machine only provides angles; it does not judge.

The VAR machine does not blow the whistle; it only teaches us how to see what we are about to believe.

That sounds abstract, but in Vietnamese football it means something concrete. When a situation goes to the monitor, the fan at home and the fan in the stadium do not see the same thing. The fan at home sees the broadcast feed, often in slow motion, with curated angles and commentary. The fan in the stadium sees a big screen if the ground has one, or nothing at all. The referee sees a small monitor at the touchline, with angles chosen by the VAR team. Four groups, four different datasets, one situation.

That is why arguments in Vietnam rarely end. Not because someone is wrong, but because no one is looking at the same set of data. And when arguments do not end, trust is not built — it is simply worn down matchday by matchday.

A transparent system would record: which incident was checked, who requested the check, which angles were viewed, how long it took, and the final reason. This data exists inside the VAR room. It is not published. And that publication gap is what turns a technical process into a black box.

Perspective: A self-built dataset and what it exposes

I have a habit many consider pointless: building my own tracking table of VAR incidents in V.League 1 and national-team matches. Over the last two seasons I logged several dozen incidents with VAR involvement, classified by type (goal, penalty, red card), review time, direction of decision (upheld or overturned), and — most importantly — whether a post-match explanatory notice followed.

The result is not shocking, but it deserves a straight look:

| Criterion | Observation | Note | |---|---|---| | Average review time | Roughly 1-3 minutes | Longer than international norms in many cases | | Rate of overturning | Skewed toward upholding | Suggests a very strict intervention threshold | | Post-match explanation | Almost none | The largest gap | | Release of VAR audio | None | A divergence from several top leagues | | Open data for the public | None | Independent verification impossible |

The last row is the most important. When there is no open data, every analysis — including mine — is only a grounded guess, not evidence. And a football nation cannot build public trust on guesses.

In some top leagues, steps toward transparency have already happened: releasing the audio between the referee and the VAR team on major incidents, publicly explaining decisions in post-matchday bulletins. That does not make controversy disappear. It changes the nature of controversy — from "he is corrupt" to "I disagree with how he reads the law." The difference between those two sentences is the difference between suspicion and disagreement. A mature football nation needs disagreement, not suspicion.

Handball: A problem with no solution, only versions

If I had to pick one law that most clearly exposes the design problem, I would pick handball. It is the clause amended repeatedly in a short span, and each amendment leaves a new crack.

The pandemic handball law was a logic accident, and the people who designed it did not realize it.

During the pandemic period, when global competitions had to restart under special conditions, IFAB tightened the interpretation of handball. The result was a historic wave of penalties across many leagues, where any touch of the hand in an extended position was treated as an offense. Then the lawmakers had to loosen it again, because the number of penalties became absurd relative to any intuition of fairness.

What is striking is not the tightening or loosening. What is striking is that the lawmakers never modeled the human arm as a physical object. A player sprinting, rotating, jumping — the arm is not in a fixed position. It has momentum. It has inertia. It cannot suddenly vanish or press tight to the body within a fraction of a second. Yet the law demands a nearly static standard.

In Vietnam, the problem multiplies due to a local factor: pitch and turf conditions in some matchdays make the ball bounce abnormally, make its trajectory hard to predict, and force players into movements they would not have to make on a better surface. A standard designed in a European meeting room, applied to a tropical humid turf, produces a kind of injustice nobody intended: a player is punished because the ball bounced into his hand, not because he deliberately touched it.

Clear and obvious — how sports law names its own helplessness.

That phrase, in the handball context, is nearly meaningless. Because when we say "clear," we assume a shared standard everyone sees alike. But in handball, no such shared standard exists. There are two referees, possibly two readings. What is called "clear" is in fact "clear enough for me to dare overturn" — a psychological threshold, not a technical one.

Counterintuitive: The referee is not the culprit

This is the part I know will annoy many, but I must write it.

I do not watch a match through the eyes of a spectator, but through the eyes of the one being judged by spectators.

In years on this beat, I have never met a referee who walked onto the pitch intending to get it wrong. What I have met far more often are referees placed in situations where every choice is wrong — because the law does not give them a right one. When the law is vague, the whistle-bearer is not free; they are bound to one reading, and every reading can be contested.

In Vietnam, this pressure is heavier than usual. A decision on a V.League 1 matchday can get a referee named across forums for days. That creates a kind of risk no training course can solve: psychological risk. And when people fear being wrong, they lean toward the safe option — upholding the original decision. That is not cowardice. It is a rational response to a system that does not protect them.

One point I want to make clear to avoid being misread: I am not defending any specific decision. I am pointing out that blaming individuals is a far easier way to avoid the problem than looking at the design. When a process keeps producing controversy everywhere in the world, not just in Vietnam, the highest probability is that the problem lies in the process — not in thousands of separate individuals all erring in the same way.

The same is true of the VFF and VPF. These are organizations operating with limited resources, balancing the league, the national team, youth development and international relations. Blaming them explains nothing. Finding the gap in the system's design — that does.

The language of the laws: A tool that camouflages power

There is a layer rarely discussed: the language of the laws. Phrases like "subjective judgment," "clear error," "insufficient grounds to intervene" do not make the law clearer. They make it appear clearer, while effectively handing the decision to the interpreter.

This is what I find most interesting in this profession. Football law, unlike criminal or civil law, is written to be read in a few seconds, under maximum physical load, with incomplete information. No clause is designed for a courtroom. Yet fans judge it like a courtroom. That is a structural mismatch.

When a fan says "the referee had to blow," they implicitly assume an absolute standard. When a referee says "I saw enough not to blow," he is operating within a relative standard. No one is logically wrong. They are using two different frames of reference, and nothing in the law forces those frames to align.

This is why I believe the most important reform is not adding technology, but adding language. A law that states clearly "what arm position counts as extended, and why" is worth more than ten extra cameras. Technology helps us see what we already have more clearly. It does not help us decide what we ought to see.

Economic consequence: When trust is an asset

Few place two numbers side by side: the level of refereeing controversy and the commercial value of a league. But they are linked.

A league seen as lacking fairness finds it harder to sell broadcast rights, harder to attract international sponsors, and harder to retain neutral fans. This is not a moral speculation; it is market logic. Sponsors do not fear controversy — they fear controversy over legitimacy. A controversial decision is content. A league under suspicion is risk.

V.League 1 has an advantage many regional leagues lack: a fiercely passionate fan base and a generation of better-trained players. But that advantage only converts into value if trust is protected. And trust, in modern football, is protected by data, not by statements.

Four concrete proposals, not slogans

First, publish a summary after each matchday. Full audio is not needed at the outset — only a table listing VAR incidents, review time, direction of decision and a one-line reason. One page per matchday. Cost near zero. Value to trust, large.

Second, standardize time. Set a maximum threshold for review, and require the VAR team to conclude within it, or accept that the decision stands. Longer time does not make a decision more correct; it only makes the match colder.

Third, provide open data to the research community. A public dataset of VAR incidents, even in raw form, would let people like me — and many better than me — verify, compare and detect tendencies. This is how a football nation learns about itself.

Fourth, reform the language of the laws. Instead of continuing to rely on unmeasurable phrases, the ambiguous clauses should be rewritten into testable criteria. Not to eliminate judgment — that is impossible in this sport — but to limit the zone of judgment, and force everyone to judge within the same zone.

Conclusion: What lies ahead

Vietnamese football is at a special moment. A talented generation of players, a huge fan base, and a football industry trying to professionalize faster than its infrastructure can follow. In such a period, the data void is not a small technical detail. It is a bottleneck.

I do not think the problem will be solved by an administrative decision. I think it will be solved by habit: the habit of recording, the habit of publishing, the habit of verifying. Progressive football nations are not those that err less; they are those that record their errors and let others read them.

The question I leave is not "was the referee right or wrong." The question is: if tomorrow brings a situation like the night in Bangkok, can we explain it with data, or will we still have to explain it with emotion? How we answer that will shape not just one season, but an entire decade of Vietnamese football.