Vietnamese Football and the Data Void: When Belief Isn't Enough to Fill the Table

In the last three matches, a V.League team allowed their opponents to take an average of 14 shots on goal, but conceded only once. In the stands, fans call it the courage of champions. On the bench, the coaching staff calls it luck. In the data analysis room, we call it a red signal that hasn't been read correctly.

Vietnamese football is entering a phase where tactical narratives and data are beginning to collide. Top clubs like Hanoi FC, Cong An Hanoi, and Thep Xanh Nam Dinh no longer rely solely on inspiration. They play by system, by zone pressing, by pre-programmed passing rotations. But as I watched this season's matches, what caught my attention wasn't the beautiful plays, but the growing information gap between what fans believe and what the data shows.

I've spent most of my career writing about football from Barcelona, where every pass is recorded, every pressing action has a metric. When I look back at the V.League, I see a league full of potential but lacking sufficiently strong measurement tools. Not because clubs don't want them, but because the data infrastructure here remains fragmented. Some clubs have analytics departments, but they operate quietly, without sharing. Local sports media often reports based on eye observation, and that creates a major problem: tactical claims are made without verifiable evidence.

The core issue isn't which team is better, but that we're building the season's narrative on a foundation of unverified data.

Take, for example, how V.League teams deploy pressing. In a typical match this season, the league-leading team had an average PPDA of 11.3 – a decent figure, indicating relatively active pressing. But when facing a bottom-table team, this metric jumped to 18.7. That means they actively played lower, ceded control, and waited for mistakes. In the stands, people say this team "knows themselves and their opponent." In the analysis room, it's a sign of a team losing control.

The problem is that there is no independent data source confirming these metrics in the V.League. We have to collect them manually from televised matches, using hand-measurement tools, and sometimes we can only estimate. When you analyze a team without accurate data, you're doing the work of a journalist rather than an analyst. And that concerns me.

I once wrote that possession rate is the most deceptive metric in football. Looking at the V.League this season, that's truer than ever. A team can hold 62% possession but only take 7 shots on goal – most of which are long-range efforts with no real danger. Fans see the home team "dominating," but in reality, they're passing the ball back and forth in midfield without threatening the opponent's defensive structure.

When I followed the Vietnamese national team's matches under different coaches, I noticed a similar pattern. Matches where the team dominated possession often ended with unexpected results. Conversely, matches where the team actively played deep, pressed in an organized manner, and capitalized on chances delivered victories. That's not a coincidence. It's the difference between a team built on inspiration and a team built on system.

The unsung hero doesn't need goals to be remembered, but they need data to be recognized.

Here, I must admit something: my analysis of the V.League could be wrong. I don't live in Vietnam, I'm not in the stands every week, and I don't have access to clubs' internal data. What I write is based on remote observation, combined with data from public sources and a network of observers I trust. But as I told my editors years ago: the number 10 shirt is sometimes just a curtain hiding emptiness – and the same is true of an analytical report without data backing.

What I want to see in the V.League isn't articles praising each other. I want to see clubs publicly share their pressing and passing data. I want to see Vietnamese sports journalists trained to read xG and PPDA, rather than relying solely on feeling. And I want to see a league where fans can debate tactics based on numbers, not belief.

When I left Lisbon years ago, I learned that empires also fall. Vietnamese football is at a point where building a sustainable data system could be the most important step to elevate the league to a new level. But if we continue making tactical judgments without foundation, everything is just an echo in an empty stadium – where I hear the breathing of a sport that was once loud.

Will V.League clubs be ready to open their data doors, or will they continue to guard their secrets in their small analysis rooms?