Verify First, Speak Later: Vietnamese Football and the Flood of Ownerless Data

At a press conference after a V.League round, a colleague held up his phone and read aloud: “The home team ran 118 kilometres, nearly nine more than the opponent.” Nobody asked where that number came from. Within two hours, four sports outlets republished it word for word. When I opened the heat map and GPS data from the match, the real total distance was just over 106 kilometres. The difference never existed on the pitch. It existed only in a spreadsheet nobody checked.

Based on my experience tracking matches, this is not an isolated case. It is a mechanism. And every mechanism can be dismantled — if we sit down long enough to read each link.

Vietnamese football is in a phase I call “import the data first, import the discipline later.” The V.League has data providers. Clubs have analysts. National team matches are tracked with GPS and wide-angle cameras. The supply has arrived. But the verification infrastructure has not. There is no unified data standard. There is no cross-checking mechanism between providers. And there is almost no habit of citing sources.

When I worked in South Korea, every published number had to come with a source and an update date. In Vietnam, many analysis pieces still use data as decoration: pretty, plausible, and untraceable. This is nobody's individual fault. It is the structural gap of a football culture growing faster than its own verification system.

I once saw a match where three data providers produced three different possession figures, differing by seven percentage points. All three were cited, in three different articles, by three authors who believed they were telling the truth. None was subjectively wrong. But the reader was misled.

The regional comparison makes the gap clearer. South Korea's league has had data auditing for years. Japan's league has public disclosure standards. Southeast Asia, Vietnam included, still lets everyone do it their own way. That diversity is not a strength. It is the ideal condition for false information to breed.

The mechanism here resembles money laundering, only the currency differs. An ownerless number reposted three times becomes a “widely cited figure.” By the fourth time, nobody asks for the source. By the fifth, it becomes the basis for a tactical claim. And that claim becomes the basis for a decision — on personnel, on tactics, on transfers.

Space is currency, pressure is interest. When I price a pressing action, I do not count how many times a player ran. I measure the space that action takes away from the opponent, and the pressure it puts on decision time. Those two measures are the real money. Distance covered is merely nominal interest — easy to read, easy to impress with, and easiest of all to be fooled by.

Take possession. A team with 65% possession but circulating only in its own half and along the two flanks is controlling a number, not the match. A team with 35% possession that occupies the zone between full-back and centre-back — where nobody is truly responsible — is controlling space. If I give you only the numbers 65 and 35, I have told you a false story, even though both numbers are true.

The same happens with expected goals. A team with a higher figure is often described as “deserving to win.” But that figure aggregates every shot, without separating shots from set pieces, from counterattacks, or from a random scramble at the edge of the box. One total, three completely different scoring mechanisms, three completely different ways of defending. Citing the total without separating the mechanisms is a form of intellectual laziness disguised as data.

Data does not lie, but it never tells a story either. A number does not place itself in context. A number does not say where it was measured, with what device, under what conditions. The storyteller does that. And the storyteller can embellish.

I have embellished. In 2026, during a South Korea national team match in Nizhny Novgorod, I said the word “half-space” twelve times in the first half, eagerly explaining that a player needed to drift inside. The home team lost, and social media called me a “professor in the clouds.” They were right. I used the term before checking coordinates. I told a story before verifying the mechanism.

That lesson shaped how I write today. Since then, every analysis of mine must include a hand-drawn position map, and every concept must come with a concrete image. Instead of “half-space,” I write: the zone between full-back and centre-back, where nobody is truly responsible. The same idea. But one phrasing can be verified, and the other cannot.

The counterintuitive angle: most people in Vietnamese football believe the problem is a lack of data. I argue the problem is a lack of verification discipline. Adding data without adding verification only enlarges the flood. A single match can generate thousands of data points. If nobody is accountable for the source of each one, we merely trade a small ambiguity for a larger one, more beautifully presented.

The second counterintuitive layer is deeper. Even when every number is verified, it is still not enough. The pitch does not lie; only the storyteller embellishes. Given the same verified dataset, two analysts can reach two opposite conclusions, and both can be technically honest. The difference is not in the data. It is in the spatial frame the analyst chooses to read the data through.

That is why I refuse reports that are only tables of numbers. A table without a position map is a table without a spine. You can read it, cite it, but you cannot verify it. And what cannot be verified should not become the basis for a decision.

There is another temptation I call “turning rebuttal into sentencing.” When you find a wrong number, the natural reflex is to indict whoever produced it. I have nearly fallen into that trap many times. But attacking the number is useful; attacking the person who produced it only adds noise to the very market I am trying to clean up. The only right way is to point out the gap in the verification chain, then let readers cross-check for themselves.

This is especially true in the transfer market. There, an inflated number can drive up a player's price, and the beneficiary is not the reader. But that is a story for another piece. Here, I only want to say that deliberate noise is the enemy of the verified voice.

Vietnamese football does not need another data platform. It needs a culture of attribution. One simple rule: if you cannot trace a number's origin, do not let it underpin a claim. It sounds small. But every major change in this industry begins with a small rule followed seriously.

I do not see the future; I only read the structure of the present. And the present structure of Vietnamese football reveals a game learning to speak before learning to check. The question is not when we will have enough data. The question is when we will have enough courage to say: “I have not yet verified this number.”