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 Nicolò Fagioli

Nicolò

Fagioli

CMItaly · ACF Fiorentina

№ 432090Elite €8.4M +0.64

Close-up

Image: FootyLogos

Player dossierSerie A

NicolòFagioli

CMCentral MidfieldMidfield

Club
ACF Fiorentina
League
Serie A
Nationality
Italy
Age
25
Height
178 cm
Foot
Right
Valued
29 May 2026

Reading the valuation

The market values Fagioli at €16M. Model A, which never saw Fagioli during training, estimates €8.4M: the market value is 90% above that estimate.

That is a factor of ×1.90. 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 €6.9M, 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.

▲ +0.64A €8.4M▲ +0.84B €6.9M
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
73
Minutes
4,507
Goals
3
Assists
6
Started
49/73
Min / app
62
Cards
9Y 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 Fagioli…

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 €16M

Checking API
EmergingEstablishedEliteWorld Class€2M€10M€30M€100k€1M€100MMarket €16MModel A €8.4M

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 1,687 midfielders

Nicolò Fagioli's percentiles among midfielders: Goals per 90 38th, Assists per 90 60th, Minutes, two years 81st, Starts 46th, Minutes, last 365 days 87th, European club minutes 70th38thGoals60thAssists81stMinutes46thStarts87thRecent70thEurope

Dashed ring: the midfielder median (50th percentile)

Minutes, last 365 days

Club minutes in the final year of the window: recent involvement, or the absence of it.

2,771 this player1,541 midfielder median87th percentile

0peer deciles · median line · this player ●4,800

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
€900k
Jun 2020
Peak
€35M
Jun 2023
Model target
€16M
May 2026
Valuations
19
4 club changes
May 2026€16MACF FiorentinaValuation the model is trained to reproduce

May 2026: €16M, ACF Fiorentina. Dotted lines mark the €2M, €10M and €30M tier boundaries.

Show as a table
DateMarket valueClub
2020-06-26€900kJuventus U23
2021-01-11€900kJuventus FC
2021-03-23€1.2MJuventus FC
2021-06-03€1.2MJuventus FC
2021-12-29€3.5MUS Cremonese
2022-03-15€4MUS Cremonese
2022-06-06€6.5MUS Cremonese
2022-11-11€8MJuventus FC
2023-03-21€20MJuventus FC
2023-06-15€35MJuventus FC
2023-12-20€15MJuventus FC
2024-06-05€15MJuventus FC
2024-07-18€20MJuventus FC
2024-12-18€20MJuventus FC
2025-03-25€18MACF Fiorentina
2025-06-17€18MACF Fiorentina
2025-12-23€14MACF Fiorentina
2026-03-24€16MACF Fiorentina
2026-05-29€16MACF Fiorentina

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
+0.644

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 79% of the 507 Serie A players.

€100k€750k€5M€30M€16MSee them in the Explorer →

Midfielders, all leagues1,687 players · median €2M

Valued above 86% of the 1,687 midfielders.

€20k€200k€2M€20M€16MSee them in the Explorer →

Where Fagioli 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).