Woyo

Coulibaly

RBMali · US Sassuolo

№ 592975Established €3.2M −0.46

Player dossierSerie A

WoyoCoulibaly

RBRight-BackDefender

Club: US Sassuolo
League: Serie A
Nationality: Mali
Age: 27
Height: 182 cm
Foot: Both
Valued: 29 May 2026

Reading the valuation

The market values Coulibaly at €2M. Model A, which never saw Coulibaly during training, estimates €3.2M: the market value is 37% below that estimate.

That is a factor of ×1.59. 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 €1.2M, 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: 41
Minutes: 2,453
Goals: 0
Assists: 2
Started: 24/41
Min / app: 60
Cards: 4Y 1R

Club matches, two years to the valuation date

The Valuation Journey

What moves Model A

Asking the prediction API to explain Model A for Coulibaly…

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 €2M

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 2,065 defenders

Dashed ring: the defender median (50th percentile)

Assists per 90

Club assists per 90 minutes in the same window.

0.07 this player0.04 defender median69th percentile

0.00peer deciles · median line · this player ●0.58

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: €300k; Sept 2019
Peak: €2M; Dec 2023
Model target: €2M; May 2026
Valuations: 17; 3 club changes

May 2026€2MUS SassuoloValuation the model is trained to reproduce

May 2026: €2M, US Sassuolo. Dotted lines mark the €2M, €10M and €30M tier boundaries.

Show as a table

Date	Market value	Club
2019-09-30	€300k	Le Havre AC
2020-01-06	€400k	Le Havre AC
2020-04-08	€350k	Le Havre AC
2020-08-14	€400k	Le Havre AC
2020-11-11	€1M	Le Havre AC
2021-06-25	€1M	Le Havre AC
2021-12-29	€1M	Parma Calcio 1913
2022-06-06	€900k	Parma Calcio 1913
2022-12-22	€750k	Parma Calcio 1913
2023-06-12	€900k	Parma Calcio 1913
2023-10-11	€1.6M	Parma Calcio 1913
2023-12-27	€2M	Parma Calcio 1913
2024-06-03	€2M	Parma Calcio 1913
2024-12-18	€2M	Parma Calcio 1913
2025-05-30	€2M	Leicester City
2025-12-23	€2M	US Sassuolo
2026-05-29	€2M	US Sassuolo

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: −0.461

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 20% of the 507 Serie A players.

See them in the Explorer →

Defenders, all leagues2,065 players · median €2M

Valued above 49% of the 2,065 defenders.

See them in the Explorer →

Where Coulibaly appears

TerminalSerie A in the Player Explorer
TerminalSerie A 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).