Massadio
Haïdara
LBMali · Kocaelispor
Player dossierSüper Lig
MassadioHaïdara
LBLeft-BackDefender
- Club
- Kocaelispor
- League
- Süper Lig
- Nationality
- Mali
- Age
- 33
- Height
- 179 cm
- Foot
- Left
- Valued
- 21 May 2026
Süper LigReading the valuation
The market values Haïdara at €600k. Model A, which never saw Haïdara during training, estimates €541k: the market value is 11% above that estimate.
That is a factor of ×1.11. 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 €915k, 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.
- Apps
- 54
- Minutes
- 4,132
- Goals
- 0
- Assists
- 1
- Started
- 48/54
- Min / app
- 77
- Cards
- 11Y 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 Haïdara…
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 €600k
Checking APIAsking 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)
European club minutes
Share of minutes played in UEFA club competitions.
15% this player0% defender median78th percentile
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
- €250k
- Jan 2011
- Peak
- €3M
- Jan 2014
- Model target
- €600k
- May 2026
- Valuations
- 37
- 4 club changes
May 2026: €600k, Kocaelispor. Dotted lines mark the €2M, €10M and €30M tier boundaries.
Show as a table
| Date | Market value | Club |
|---|---|---|
| 2011-01-17 | €250k | AS Nancy-Lorraine |
| 2011-05-24 | €400k | AS Nancy-Lorraine |
| 2011-12-24 | €400k | AS Nancy-Lorraine |
| 2012-05-23 | €1M | AS Nancy-Lorraine |
| 2013-01-07 | €2M | AS Nancy-Lorraine |
| 2013-01-28 | €2.5M | Newcastle United |
| 2013-07-02 | €2.5M | Newcastle United |
| 2014-01-15 | €3M | Newcastle United |
| 2014-08-12 | €2M | Newcastle United |
| 2015-02-12 | €2M | Newcastle United |
| 2015-07-01 | €2M | Newcastle United |
| 2016-02-09 | €1.5M | Newcastle United |
| 2016-09-01 | €1.5M | Newcastle United |
| 2017-02-27 | €1.5M | Newcastle United |
| 2017-06-28 | €1.5M | Newcastle United |
| 2018-01-02 | €1.5M | Newcastle United |
| 2018-05-28 | €1.5M | Newcastle United |
| 2019-01-08 | €1M | RC Lens |
| 2019-06-27 | €1M | RC Lens |
| 2020-01-06 | €1M | RC Lens |
| 2020-04-08 | €800k | RC Lens |
| 2020-10-15 | €800k | RC Lens |
| 2021-01-07 | €1.5M | RC Lens |
| 2021-04-09 | €2M | RC Lens |
| 2021-06-04 | €2.5M | RC Lens |
| 2021-12-16 | €2.5M | RC Lens |
| 2022-05-30 | €2M | RC Lens |
| 2022-11-02 | €3M | RC Lens |
| 2023-06-27 | €3M | RC Lens |
| 2023-12-18 | €2.5M | RC Lens |
| 2024-06-03 | €2M | RC Lens |
| 2024-12-10 | €1.8M | Stade Brestois 29 |
| 2025-06-03 | €1.5M | Stade Brestois 29 |
| 2025-10-01 | €1.2M | Kocaelispor |
| 2025-12-17 | €900k | Kocaelispor |
| 2026-03-05 | €800k | Kocaelispor |
| 2026-05-21 | €600k | Kocaelispor |
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
- +0.103
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 →Süper Lig428 players · median €1.2M
Valued above 23% of the 428 Süper Lig players.
See them in the Explorer →Defenders, all leagues2,065 players · median €2M
Valued above 22% of the 2,065 defenders.
See them in the Explorer →Where Haïdara appears
Watchlists and the comparison tray are kept in this browser only.
Near this valuation closest observed values: same league, then same position
- YalçınCBEyüpspor · Süper Lig€600k
- BulutRBBasaksehir FK · Süper Lig€600k
- AjetiCBBodrum FK · Süper Lig€600k
- LarssonAMFatih Karagümrük · Süper Lig€600k
- SilvestriRBBologna FC 1909 · defenders€600k
- JungCBSC Freiburg · defenders€600k
- TrimmelRB1.FC Union Berlin · defenders€600k
- BellCB1.FSV Mainz 05 · defenders€600k
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).