The Empty Spreadsheet and the Trap of Analyzing Vietnamese Football

Two in the morning in Milan, I opened a spreadsheet and found a single number: zero. Not a missing column, not a formatting error — the entire sheet empty. The four thousand five hundred wide-attack situations I had spent three months building for Serie A were still sitting in another folder, and this was the file I had just received to analyse the V.League, accompanied by a short message: "the data is ready." It was not ready. And the first lesson I drew that night was not about Vietnamese football, but about my own profession. An empty sheet is also data. It is just that it speaks about the writer, not about the match.

I recount this not to complain about a broken file. I recount it because it touches exactly on a problem anyone following the V.League meets every week: we have far too much information pretending to be data, and far too little data that can actually be verified. A transfer rumour spreads across social media in ten minutes. A statistical figure is cited with nobody knowing where it came from. A quick table is assembled and then vanishes after the next round. Facing such a sea of information, the natural reflex of a writer is to fill the gaps as fast as possible. That is precisely when this profession begins to lie without anyone noticing.

The context of a football nation where data is not evenly distributed

Vietnamese football has a structural trait that any analyst arriving from abroad takes time to understand: the financial resources of clubs depend very heavily on corporate owners and sponsoring conglomerates. This is neither bad nor good — it is simply a fact to be remembered before drawing any tactical diagram. When the money comes from a domestic enterprise rather than from broadcasting rights and commercial activity, the wage structure becomes less transparent, and personnel decisions tend to follow a business cycle rather than a purely sporting one. A coach is replaced not necessarily because of three defeats. A key player is sold not necessarily because the price was good.

Therefore the first thing I always do before analysing a V.League match is not to count passes, but to clearly identify the entities: which club, who owns it, who makes the transfer decisions, how long the coach's contract runs, and where that information came from. In an environment where verifiable data is severely lacking, source reliability is the most valuable filtering tool — even more valuable than any expected-goals metric we can compute. But it is also the tool that automated analysis sheets tend to skip, because grading a source demands judgement, while a metric only needs a formula.

In Europe, I once worked in an ecosystem where every club had its own analysis department and every match was tracked by at least three independent data-collection systems. If a player unexpectedly changed position, I could cross-check it against three different sources in twenty minutes. In the V.League, I do not have that privilege. And it is precisely that shortage which taught me to analyse better — not by accepting less data, but by separating clearly what I know, what I infer, and what I do not know.

The core analysis: reading the V.League in the correct order

When I receive an analysis file as empty as that night's, the professional mistake would be to try to rescue it with imagination. A good coach, looking at an empty sheet, immediately understands: the first step is not to draw, but to trace. For Vietnamese football, I imagine a process of four layers, and any layer skipped can corrupt every conclusion that follows.

The first layer is the entity layer. Before talking about tactics, I must be able to answer: which club, which player, which coach, which competition, which moment. It sounds trivial, but most of the bad analyses I have read fail right here — they analyse a club without being able to identify who actually holds power in the technical area. At many V.League clubs, the boundary between technical director and head coach is routinely blurred. If I do not know who decides squad rotation, then every judgement about tactics is meaningless.

The second layer is the source layer. V.League transfer news has enormous variance in reliability. For the same deal, one outlet reports before the paperwork is complete, another only re-posts after the unveiling photos have spread. Classifying sources by tier — a journalist with direct access to the club, general media, or an anonymous account — is not an administrative formality. It is the decisive filter. A false story about the wage bill can make me misjudge a club's entire ambition for a whole season.

The third layer is the talent-export pathway. For years I have tracked the route Vietnamese players take abroad, and what stands out is not any single deal, but the structure of the whole journey. The contracts sending players to leagues such as the J.League or K.League have often been read as a symbol of the nation's footballing success. But looked at more closely, most of those deals were loans or short-term contracts, and the success of one individual has never equated to the success of an entire development system. Nguyễn Quang Hải moved to Pau FC in France; Nguyễn Công Phượng once went to Japan, then South Korea and Belgium — each step is a real data point, but stitching them into a story of "Vietnamese football exporting en masse" would require a level of verification that current figures do not yet permit.

The fourth layer is the fixture layer. The V.League has a particular rhythm, where a break for the national team can snap the momentum of a club flying high, and can also hand an opportunity to a side not yet in gear. Any analysis that ignores the fixture factor easily confuses genuine progress with a lucky run of matches. A heat map shows position; an intention map shows thinking. But both are meaningless if I do not know whether that club has just played three matches in seven days or has rested for two weeks.

What I want to stress here, as someone who has repeatedly misread the V.League from a distance, is that this order cannot be reversed. People like to start from the story, from the emotion, from a rising name. But if the entity layer is not solid, every story above it is sand on water. Numbers do not lie, but they do not tell the whole story either. And an inaccurate source is worse than a missing figure — because a missing figure is visible to all, while a false source carries confidence with it.

The counter-intuitive angle: the courage not to analyse

This is the part I believe most strongly, and also the part most uncomfortable for me. The whole football-analysis industry is built on an assumption never once verified: that if you have data, you must analyse, that emptiness is shameful. I used to think so. In many broadcast sessions, when someone asked me about a match for which I lacked sufficient information, my instinct was to say something plausible — a judgement that sounded intelligent, carried weight, made viewers feel I grasped the issue. It took me three months to realise I had misread this position: analysts are not paid to always have an opinion. We are paid to have correct opinions.

The empty spreadsheet that night in Milan, in the end, was an ethics test for the profession. It asked me one simple question: would I rather say "I don't have enough data to conclude," or would I rather invent an analysis that sounds complete? Vietnamese football fans deserve to hear the first truth, however less exciting it is. Because when a football nation is building an analytical culture, the most dangerous thing is not a lack of data — it is a generation of readers learning to believe conclusions without foundation, drawn from numbers nobody checks.

There is something striking: at certain moments, the empty file itself taught me more than a full sheet. It forced me to look straight at my own limits. It made me list everything I was assuming — and that list turned out to be frighteningly long. In football, as in any field that generates too many statistics, the rare thing is not data. The rare thing is honesty about what data cannot say. Emotion is not data noise; it is data not yet decoded. And emptiness, sometimes, is also data not yet decoded.

What to verify next round

I will not end with an assertion about the V.League, because I do not have sufficient grounds to do so — and that is the whole spirit of this piece. Instead, I offer a way of testing for myself and for the reader.

Next round, before believing any figure about a club, try asking three questions. Where does this number come from? Who published it first? And has it been confirmed by a second, independent source? If all three answers are blurred, then it is not data — it is a rumour carefully packaged.

Based on my experience watching matches, I spent three months in isolation drawing thirty-eight diagrams, and only four years later realised the simplest thing: four thousand five hundred situations cannot replace one trustworthy source. Vietnamese football is at a fascinating stage, as clubs begin to care about data and young coaches begin to read analysis with a more serious eye. That fascination deserves us doing it right. And doing it right sometimes begins with the shortest sentence of all: I don't have enough data. That sentence is not a failure. It is the starting point of every decent analysis.