FairValue

Checking model

Esc

  • EnvironmentOverviewWhat FairValue measures, what it found, where to go next.
  • EnvironmentTerminalExplore, compare and track players; market, league and model views.
  • EnvironmentStoriesValuations, head-to-heads and research findings, told as stories.
  • TerminalPlayer ExplorerSearch, filter and sort the player export.
  • TerminalComparison StudioTwo to four players on one scale.
  • TerminalWatchlistsNamed collections, kept in this browser.
  • TerminalMarket LandscapeHow observed value is distributed, and where the model drifts.

↑ ↓ to move · Enter to open · Esc to closeLoading player index…

Portrait of Rafael Leão

Rafael

Leão

LWPortugal · AC Milan

№ 357164World Class €30M +0.51

Image: FootyLogos

Player dossierSerie A

RafaelLeão

LWLeft WingerAttack

Club
AC Milan
League
Serie A
Nationality
Portugal
Age
26
Height
188 cm
Foot
Right
Valued
29 May 2026

Reading the valuation

The market values Leão at €50M. Model A, which never saw Leão during training, estimates €30M: the market value is 67% above that estimate.

That is a factor of ×1.67. 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 €22.7M, 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.

▲ +0.51A €30M▲ +0.79B €22.7M
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
81
Minutes
5,467
Goals
22
Assists
16
Started
63/81
Min / app
67
Cards
12Y 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 Leão…

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 €50M

Checking API
EmergingEstablishedEliteWorld Class€2M€10M€30M€100k€1M€100MMarket €50MModel A €30M

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 1,583 attackers

Rafael Leão's percentiles among attackers: Goals per 90 69th, Assists per 90 86th, Minutes, two years 94th, Starts 80th, Minutes, last 365 days 72nd, European club minutes 77th69thGoals86thAssists94thMinutes80thStarts72ndRecent77thEurope

Dashed ring: the attacker median (50th percentile)

Minutes, two years

Total club minutes in the two-year window: how much the player was used.

5,467 this player2,242 attacker median94th percentile

450peer deciles · median line · this player ●8,788

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
€500k
Sept 2017
Peak
€90M
Jun 2023
Model target
€50M
May 2026
Valuations
28
3 club changes
May 2026€50MAC MilanValuation the model is trained to reproduce

May 2026: €50M, AC Milan. Dotted lines mark the €2M, €10M and €30M tier boundaries.

Show as a table
DateMarket valueClub
2017-09-08€500kSporting CP B
2018-02-23€1.5MSporting CP
2018-04-16€4MSporting CP
2018-06-13€6MSporting CP
2018-12-17€6MLOSC Lille
2019-03-07€12MLOSC Lille
2019-06-03€15MLOSC Lille
2019-10-08€22MAC Milan
2019-12-12€22MAC Milan
2020-04-08€20MAC Milan
2020-08-25€24MAC Milan
2020-10-29€28MAC Milan
2020-12-29€28MAC Milan
2021-06-03€25MAC Milan
2021-12-28€35MAC Milan
2022-03-15€50MAC Milan
2022-06-07€70MAC Milan
2022-11-11€85MAC Milan
2023-03-21€80MAC Milan
2023-06-15€90MAC Milan
2023-12-20€90MAC Milan
2024-06-05€90MAC Milan
2024-10-18€75MAC Milan
2024-12-18€75MAC Milan
2025-06-17€70MAC Milan
2025-12-23€70MAC Milan
2026-03-24€65MAC Milan
2026-05-29€50MAC Milan

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
+0.512

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 →

Serie A507 players · median €5.5M

Joint 6th highest observed value among 507 Serie A players.

€100k€750k€5M€30M€50MSee them in the Explorer →

Attackers, all leagues1,583 players · median €2.5M

Valued above 97% of the 1,583 attackers.

€20k€300k€5M€75M€50MSee them in the Explorer →

Where Leão appears

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).