Esteban Solari at Pumas UNAM: A Coaching File Missing Three Data Columns

In the tracking sheet I build for every new head coach in Liga MX, four columns are mandatory: PPDA, xG created, xG conceded, and the share of minutes played by footballers under 23. The file on Esteban Solari at Pumas UNAM, as of his first months in charge, has only a partial entry in the fourth. The other three are not low. They are empty.

The profile I read was built from a different material: a story about a golden generation. In this sport, a legend does not score, does not press, and does not sit in any column. When a data column is empty, people fill it with narrative — and narrative cannot be audited.

I spent two evenings rereading everything written about Solari in Spanish and English. There are exactly two direct quotes from the man himself. Everything else is the writer's commentary, largely unsourced. For someone whose job is pricing probability, that is the first signal to log: the thinner the sourcing, the louder the telling.

Pumas UNAM is not an ordinary Liga MX club. It is tied to Mexico's national university, carries an academic identity, and runs a youth system the club itself treats as a strategic asset. The Estadio Olímpico Universitario is where that identity is sold back to supporters every fortnight.

Esteban Solari arrived with a CV that is hardly short of names. He was part of Argentina's U20 and U23 coaching staff as an assistant to Fernando Batista. That period overlapped with the Argentine Football Association's rebuild under Claudio Tapia, when Lionel Scaloni took over the senior team and opened the cycle that led to the 2026 World Cup title in Qatar.

That is the context. And context, in almost every coaching file, is the loudest thing told and the least thing checked.

What I need sits beneath the surface: what Solari actually did on that staff, what his playing system is, and — while Liga MX results are still pending — what is keeping him in the job. Those three questions must be answered with data. Where there is no data, I will say so plainly.

An assistant is not an author, and proximity is not authorship.

At U20 and U23 level, an assistant's job usually has four parts: observing and screening talent, designing training sessions, working individually with players, and holding the link between the coaching staff and a young dressing room. That is genuinely valuable work, and I have no intention of diminishing it.

But there is a wide gap between "being close to" and "forming". Solari was close to Alexis Mac Allister, Julián Álvarez and Thiago Almada while they were still young. He watched them grow. He was not the final decision-maker on tactics, not the man picking the starting XI, and not the man accountable for Argentina U20 results.

A headline like "the man who formed a golden generation" sells extremely well. But put it through an audit and the evidence column is empty exactly where it matters most. Numbers never lie; only the people reading them deceive themselves.

The three Argentine names are credibility assets, not proof of coaching ability.

Alexis Mac Allister — a 2026 World Cup winner, now at Liverpool. Julián Álvarez — the forward who moved from Manchester City to Atlético Madrid. Thiago Almada — a standout at Atlanta United in MLS. All three are names persuasive enough to win over any boardroom in Mexico.

Now look at the second column. All three play their club football abroad. None of them will wear a Pumas shirt next season, none will score for Pumas, and none will lift Pumas up the table. Their value to the Mexican club is purely reputational — a reputation loan with no interest rate but also no maturity date.

To someone who prices assets for a living, this is the kind of holding I always mark separately: it raises expected value in the short run but generates no cash flow. When results fail to arrive, that loan gets called in very fast.

Two opposing coaching archetypes inside a single quote.

This is the most telling point, and also the most overlooked. Solari says he draws on Ricardo "Tuca" Ferretti and Juanma Lillo.

Those two names do not belong to the same school. Ferretti is associated with pragmatism, tight defensive organisation, high discipline and closeness to players. Lillo is a devotee of possession and positional play — the school Pep Guardiola himself went to study. One builds with discipline, the other builds with spatial structure.

What does it mean when a coach cites both? There are two readings. The generous one: he is synthesising, and an identity will form over time. The strict one: he has no identity yet, and is picking safe names so he cannot be questioned.

I lean to the second reading, with a caveat. PPDA is not a measure of spirit; it is a measure of honesty in pressing. If Solari truly follows Ferretti, Pumas' PPDA will sit low — the team waits, concedes the ball and counter-attacks. If he follows Lillo, PPDA will be high, pressing early and controlling possession. You cannot be at both the top and the bottom. After enough matchdays, the spreadsheet will announce itself.

"Turbulent start" is a sentence, not a metric.

The only description of Solari's current results at Pumas is the phrase "turbulent start". No league position, no points total, no head-to-head record. To me, that is an information gap presented as an assessment.

That phrase almost certainly means results have fallen short of expectations. And the way the piece is ordered — opening on the 2026 World Cup, closing on a call for patience — is a familiar structure. I call it a reputation cushion: putting past achievements first so the present record is read in softer light.

There is nothing unethical about that structure. It is simply the thing I have to subtract when pricing. When a coaching file gives two-thirds of its space to the past and one-third to the present, that ratio says a great deal about the present.

Pumas' operating model matters more than Solari's name.

Pumas hired a coach with a youth-development background at a club whose leadership says openly it wants academy-grown players to reconnect with supporters. That is a fit of model, not a stroke of luck.

For years Liga MX has functioned as a league that develops and resells young South American talent. A club betting on an academy pathway needs someone who speaks the language of a 19-year-old, absorbs the pressure when that teenager errs, and has the patience not to burn him after three matches. By that measure, Solari is not an irrational appointment.

The problem lies elsewhere: that model only pays dividends after two or three seasons. While it waits, the table is still updated every week, and the stands are still counting.

Correlation is not causation, and this is the easiest trap to fall into.

In 2026, when I brought expected goals into an argument in Beijing, the most common reaction was not disagreement but silence followed by a return to gut feeling. In 2026 I put xG in front of the sceptics. Seven years later, they are still arguing. What I learned is not that numbers always win, but that numbers only win when placed in the right slot.

Placing Solari beside Argentina's golden generation is placing a correlation variable in a causation slot. He was near them. He did not create them. Accept that logic and you must also accept that every assistant on that staff deserves the same credit — and the coaching market does not operate that way.

Solari's biggest risk at Pumas is not tactical. It is expectation. Once the "he formed a golden generation" story is repeated enough, it becomes the yardstick. And that yardstick, for a club that needs time, is the wrong one. Prejudice is a match with no data. I choose to bet on the number.

One more thing needs saying: the 2026 World Cup legend is still paying dividends to people who merely stood near it. That is a real reputation-monetisation model in this industry, and it only collapses when results fail to follow.

Assumptions and lag.

In 2026, when football shut down, the data showed home advantage falling sharply without crowds. I profited from that model, then lost four bets in a row because I refused to update the parameters. Since then, every analysis I write closes with a list of signals to track, plus a warning about data lag.

With Solari, I am watching four things. One: Pumas' PPDA — it will reveal whether he leans Ferretti or Lillo. Two: minutes played by academy players in the first team, because that is the only promise that can be verified. Three: actual Liga MX results, not the tone of the press. Four: the moment the story turns — when "golden generation" starts being used to interrogate rather than to praise.

For now, the file is still missing three columns. I will not fill them with belief.