Vietnamese Football and the Data Gap: What Do Analysts Actually Rely On?

Last season I sat in the stands at Hang Day Stadium for a match in which both teams pressed each other for the entire first half. After the final whistle I opened my laptop to look up PPDA — the metric that measures pressing intensity — and realised nobody had recorded it. No Opta, no StatsBomb, no statistical table could tell me how many times the away side had lunged into a challenge during the opening forty-five minutes. All I had was a notebook with a few hurried lines, a handful of photographs from the stands, and my own memory. That night I finished the piece with my eyes, not with numbers. The rhythm of a match is the only thing that cannot fake itself, but that rhythm only settles in the mind of someone who stays long enough.

That shortfall is not the private problem of a small league. The metrics European fans treat as defaults — expected goals, passes allowed per defensive action, pass-completion rates by pitch zone — largely do not exist in the V.League, or exist only in crude form, gathered piecemeal by a few private operators. Vietnamese clubs still work with video recordings, with scouts who travel to the ground, with assistant coaches' written reports. That way of working is not wrong. It is simply different, and that difference carries a cost.

The cause lies in infrastructure. An automated data-collection system needs multi-angle cameras, recognition software, trained operators, and above all money. The budget of a V.League club is sometimes a fraction of what a mid-table European academy spends. Investment in data does not yet generate direct revenue, so it always sits at the bottom of the priority list. Meanwhile, every V.League match still produces thousands of moments worth recording that nobody records.

The first consequence belongs to the transfer market. When a club wants to sign a striker from another league, it usually has to trust video and the recommendation of an intermediary. There is no underlying data to verify whether that player genuinely creates chances or merely scores from lucky situations. A striker who scores ten goals from ten low-xG chances will be priced higher than one who scores eight from twenty high-xG chances — but in Vietnam, nobody can usually tell the two apart. Transfer values are therefore driven by feeling, not by evidence.

The second consequence belongs to the national team. When the head coach needs to select players, he relies on video and scouting reports. That is not wrong, but it limits how many players can be assessed within a given window. Without data, attention flows to those who are already famous. Players performing well but rarely mentioned in the media are easily left behind, even when they may be playing exactly the kind of football the national team needs.

The third consequence belongs to youth development. An academy that wants to know whether it is developing in the right direction needs to measure each player's progress over time. Without data, evaluation depends on a coach's feel — which can be remarkably accurate, but is also easily swayed by a few beautiful moments. One young player can be rated highly for a single flashy touch, while another who held his position correctly all season is overlooked.

But here is where I want to argue against what many in the trade assume. A shortage of data does not mean a shortage of analysis. Across years following teams, I have found that the people who understand Vietnamese football best — veteran coaches, scouts who travel the provinces, supporters who have sat in the same corner of the stand for twenty years — hold a store of knowledge that fits in no spreadsheet. They remember which foot a player shoots with, where he loses the ball, how he moves when his team is behind. That is living data; it is merely not encoded as numbers.

The real trap lies elsewhere. When an analyst lifts the European framework wholesale — financial fair-play rules, metrics that only exist in globally broadcast leagues — and applies it directly to a V.League club, the result is usually meaningless, sometimes actively misleading. A club without meaningful broadcast revenue will not "breach" a European-style financial rule, because that rule was designed for an entirely different ecosystem. For a club with no xG, the sentence "this team has low xG" is not analysis; it is fabrication dressed in professional clothing.

The most worrying thing is not the absence of data, but pretending that data exists. A report with every metric field filled in looks highly persuasive — until someone discovers those numbers were never measured. In this trade, manufactured confidence is more dangerous than admitting you do not yet understand everything.

What I hope for is not that the V.League will soon hold a data system on a par with Europe — that is still far off. I hope for something closer: that people in the profession dare to state clearly what they are basing their analysis on. Misspell a name once, and you understand a whole career — I learned that when I wrote a player's name wrongly and the entire community reminded me of it. Keeping the beat is not about running faster; it is about making sure nobody is left behind. For Vietnamese football, keeping that beat means measuring with the eye first, and writing down a number only when the number genuinely exists.