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 Junior Messias

Junior

Messias

RWBrazil · Genoa CFC

№ 449151Emerging €1M +0.07

Close-up

Image: FootyLogos

Player dossierSerie A

JuniorMessias

RWRight WingerAttack

Club
Genoa CFC
League
Serie A
Nationality
Brazil
Age
35
Height
174 cm
Foot
Left
Valued
29 May 2026

Reading the valuation

The market values Messias at €1.1M. Model A, which never saw Messias during training, estimates €1M: the market value is 7% above that estimate.

That is a factor of ×1.07. Model A's typical held-out miss is ×1.50 either way, so this gap is within its usual error.

Without league and club, Model B estimates €225k, 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.

▲ +0.07A €1M▲ +1.59B €225k
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
40
Minutes
1,685
Goals
5
Assists
2
Started
15/40
Min / app
42
Cards
2Y 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 Messias…

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 €1.1M

Checking API
EmergingEstablishedEliteWorld Class€2M€10M€30M€100k€1M€100MMarket €1.1MModel A €1M

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

Junior Messias's percentiles among attackers: Goals per 90 51st, Assists per 90 34th, Minutes, two years 36th, Starts 18th, Minutes, last 365 days 27th, European club minutes 28th51stGoals34thAssists36thMinutes18thStarts27thRecent28thEurope

Dashed ring: the attacker median (50th percentile)

Goals per 90

Club goals per 90 minutes played in the two years to the valuation date.

0.27 this player0.26 attacker median51st percentile

0.00peer deciles · median line · this player ●1.17

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
€25k
Nov 2016
Peak
€6.5M
Dec 2021
Model target
€1.1M
May 2026
Valuations
23
5 club changes
May 2026€1.1MGenoa CFCValuation the model is trained to reproduce

May 2026: €1.1M, Genoa CFC. Dotted lines mark the €2M, €10M and €30M tier boundaries.

Show as a table
DateMarket valueClub
2016-11-30€25kASD Chieri Calcio
2017-06-30€125kASD Chieri Calcio
2018-02-01€100kASDC Gozzano
2018-06-22€125kASDC Gozzano
2018-12-13€150kAC Gozzano
2019-06-19€175kAC Gozzano
2019-12-30€350kFC Crotone
2020-04-08€300kFC Crotone
2020-08-21€1MFC Crotone
2020-10-29€2MFC Crotone
2020-12-29€3MFC Crotone
2021-06-03€3.5MFC Crotone
2021-10-14€5MAC Milan
2021-12-28€6.5MAC Milan
2022-06-07€6MAC Milan
2022-11-11€6MAC Milan
2023-06-15€4.5MAC Milan
2023-12-20€3MGenoa CFC
2024-06-05€2.5MGenoa CFC
2024-12-18€2MGenoa CFC
2025-06-17€1.5MGenoa CFC
2025-12-23€1.2MGenoa CFC
2026-05-29€1.1MGenoa CFC

Audit context group-level, not about this player

Audit group
non-UEFA
Population gap, Model A
+0.093 95% CI +0.063 to +0.124
This player, market vs held-out A
+0.071

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

Valued above 11% of the 507 Serie A players.

€100k€750k€5M€30M€1.1MSee them in the Explorer →

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

Valued above 34% of the 1,583 attackers.

€20k€300k€5M€75M€1.1MSee them in the Explorer →

Where Messias 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).