UnaiMarrero

GKGoalkeeperGoalkeeper

Club: Real Sociedad
League: LaLiga
Nationality: Spain
Age: 24
Height: 189 cm
Foot: Right
Valued: 5 Jun 2026

Reading the valuation

The market values Marrero at €1M. Model A, which never saw Marrero during training, estimates €2.1M: the market value is 53% below that estimate.

That is a factor of ×2.13. Model A's typical held-out miss is ×1.50 either way, so this gap is larger than its usual error.

Without league and club, Model B estimates €2.4M, further from the market. Model B is usually further off (typical miss ×2.07): league and club explain much of how the market prices players.

A gap describes the model's arithmetic for this player's inputs, not what the player is worth.

Pitch length is a log value scale fitted to this player's figures. ● observed · ◇ Model A · dashed ◇ Model B · each arc is a residual, log(observed) − log(estimate).

Apps: 15
Minutes: 1,440
Started: 15/15
Min / app: 96
Cards: 1Y 0R

Club matches, two years to the valuation date

The Valuation Journey

What moves Model A

Asking the prediction API to explain Model A for Marrero…

SHAP describes the model's arithmetic for this player's inputs, not what causes market value. Model B can be explained only by the live service; Model A also has a published explanation for the research players.

Model A vs Model B against the observed €1M

Checking API

Asking the prediction API…

Held-out estimates come from cross-validation, with this player outside the training data: the honest comparison. Served models were refitted on every player, this one included, so they sit closer to the market. Shaded band: Model A's typical miss (×1.50 either way).

Player traitspercentiles vs 485 goalkeepers

Dashed ring: the goalkeeper median (50th percentile)

European club minutes

Share of minutes played in UEFA club competitions.

19% this player0% goalkeeper median83rd percentile

0%peer deciles · median line · this player ●86%

No passing, progression or defensive actions exist in the dataset, so no trait claims to measure them.

Valuation history every Transfermarkt valuation on record

First valuation: €150k; Aug 2021
Peak: €1M; Jun 2026
Model target: €1M; Jun 2026
Valuations: 13; 2 club changes

Jun 2026€1MReal SociedadValuation the model is trained to reproduce

Jun 2026: €1M, Real Sociedad. Dotted lines mark the €2M, €10M and €30M tier boundaries.

Show as a table

Date	Market value	Club
2021-08-10	€150k	Real Sociedad C
2021-12-30	€150k	Real Sociedad C
2022-06-29	€150k	Real Sociedad C
2022-12-29	€200k	Real Sociedad B
2023-06-30	€250k	Real Sociedad B
2023-10-13	€300k	Real Sociedad
2023-12-22	€300k	Real Sociedad
2024-06-07	€300k	Real Sociedad
2024-12-27	€300k	Real Sociedad
2025-03-21	€600k	Real Sociedad
2025-06-09	€600k	Real Sociedad
2025-12-12	€600k	Real Sociedad
2026-06-05	€1M	Real Sociedad

Audit context group-level, not about this player

Audit group: UEFA
Population gap, Model A: +0.093 95% CI +0.063 to +0.124
This player, market vs held-out A: −0.758

The group comes from first-listed citizenship and is never a model input. Across the population, non-UEFA players' market values sit about 10% above Model A's held-out estimates, relative to UEFA players in the same leagues. One player's residual says nothing about that pattern (typical miss ×1.50), and none of it is evidence of discrimination: the target may itself be biased. Open the Fairness Audit

In context observed value among comparable players in this build

All players in the Terminal →

LaLiga509 players · median €4M

Valued above 8% of the 509 LaLiga players.

See them in the Explorer →

Goalkeepers, all leagues485 players · median €1M

Valued above 48% of the 485 goalkeepers.

See them in the Explorer →

Where Marrero appears

TerminalLaLiga in the Player Explorer
TerminalLaLiga on the League Landscape

Watchlists and the comparison tray are kept in this browser only.

Near this valuation closest observed values: same league, then same position

Counts and ranks of observed Transfermarkt values only; model errors are never ranked here. Full player export: Every player in the modelling population (D-011).