Ousmane
Diomande
CBCote d'Ivoire · Sporting CP
Image: FootyLogos
Player dossierLiga Portugal
OusmaneDiomande
CBCentre-BackDefender
- Club
- Sporting CP
- League
- Liga Portugal
- Nationality
- Cote d'Ivoire
- Age
- 22
- Height
- 190 cm
- Foot
- Right
- Valued
- 28 May 2026
Liga PortugalReading the valuation
The market values Diomande at €42M. Model A, which never saw Diomande during training, estimates €25M: the market value is 68% above that estimate.
That is a factor of ×1.68. 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 €18.1M, 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
- 70
- Minutes
- 5,469
- Goals
- 3
- Assists
- 2
- Started
- 63/70
- Min / app
- 78
- Cards
- 15Y 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 Diomande…
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 €42M
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.
25% this player0% defender median90th 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
- €400k
- Dec 2022
- Peak
- €45M
- May 2025
- Model target
- €42M
- May 2026
- Valuations
- 10
- 1 club change
May 2026: €42M, Sporting CP. Dotted lines mark the €2M, €10M and €30M tier boundaries.
Show as a table
| Date | Market value | Club |
|---|---|---|
| 2022-12-28 | €400k | CD Mafra |
| 2023-03-02 | €4M | Sporting CP |
| 2023-06-16 | €10M | Sporting CP |
| 2023-09-29 | €25M | Sporting CP |
| 2023-12-27 | €40M | Sporting CP |
| 2024-06-06 | €40M | Sporting CP |
| 2024-12-19 | €40M | Sporting CP |
| 2025-05-30 | €45M | Sporting CP |
| 2025-12-18 | €45M | Sporting CP |
| 2026-05-28 | €42M | Sporting CP |
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
- +0.519
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 →Liga Portugal423 players · median €1M
Joint 4th highest observed value among 423 Liga Portugal players.
See them in the Explorer →Defenders, all leagues2,065 players · median €2M
Valued above 98% of the 2,065 defenders.
See them in the Explorer →Where Diomande appears
Watchlists and the comparison tray are kept in this browser only.
Near this valuation closest observed values: same league, then same position
- QuendaRWSporting CP · Liga Portugal€42M
- CostaGKFC Porto · Liga Portugal€40M
- TrincãoAMSporting CP · Liga Portugal€40M
- InácioCBSporting CP · Liga Portugal€40M
- ChalobahCBChelsea FC · defenders€40M
- KonsaCBAston Villa · defenders€40M
- DaviesLBBayern Munich · defenders€40M
- GarcíaCBFC Barcelona · defenders€40M
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).