Boulaye
Dia
CFSenegal · SS Lazio
Close-up
Image: FootyLogos
Player dossierSerie A
BoulayeDia
CFCentre-ForwardAttack
- Club
- SS Lazio
- League
- Serie A
- Nationality
- Senegal
- Age
- 29
- Height
- 180 cm
- Foot
- Right
- Valued
- 29 May 2026
Serie AReading the valuation
The market values Dia at €5M. Model A, which never saw Dia during training, estimates €9.7M: the market value is 49% below that estimate.
That is a factor of ×1.94. 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 €8.7M, closer to the market here, although it is usually further off (typical miss ×2.07).
A gap describes the model's arithmetic for this player's inputs, not what the player is worth.
- Apps
- 78
- Minutes
- 4,247
- Goals
- 16
- Assists
- 6
- Started
- 50/78
- Min / app
- 54
- Cards
- 4Y 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 Dia…
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 €5M
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 1,583 attackers
Dashed ring: the attacker median (50th percentile)
Minutes, two years
Total club minutes in the two-year window: how much the player was used.
4,247 this player2,242 attacker median84th 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
- €2M
- Jun 2019
- Peak
- €25M
- Jun 2023
- Model target
- €5M
- May 2026
- Valuations
- 24
- 3 club changes
May 2026: €5M, SS Lazio. Dotted lines mark the €2M, €10M and €30M tier boundaries.
Show as a table
| Date | Market value | Club |
|---|---|---|
| 2019-06-03 | €2M | Stade Reims |
| 2019-09-27 | €3.5M | Stade Reims |
| 2019-12-19 | €5.5M | Stade Reims |
| 2020-04-08 | €4.5M | Stade Reims |
| 2020-08-03 | €6M | Stade Reims |
| 2020-10-15 | €8M | Stade Reims |
| 2021-01-07 | €12M | Stade Reims |
| 2021-04-09 | €14M | Stade Reims |
| 2021-06-04 | €14M | Stade Reims |
| 2021-12-30 | €14M | Villarreal CF |
| 2022-06-03 | €12M | Villarreal CF |
| 2022-11-11 | €12M | US Salernitana 1919 |
| 2023-03-21 | €14M | US Salernitana 1919 |
| 2023-06-15 | €25M | US Salernitana 1919 |
| 2023-10-11 | €22M | US Salernitana 1919 |
| 2023-12-20 | €18M | US Salernitana 1919 |
| 2024-03-12 | €13M | US Salernitana 1919 |
| 2024-06-05 | €10M | US Salernitana 1919 |
| 2024-10-18 | €15M | SS Lazio |
| 2024-12-18 | €15M | SS Lazio |
| 2025-06-17 | €15M | SS Lazio |
| 2025-12-23 | €10M | SS Lazio |
| 2026-03-24 | €7M | SS Lazio |
| 2026-05-29 | €5M | SS Lazio |
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
- −0.664
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 45% of the 507 Serie A players.
See them in the Explorer →Attackers, all leagues1,583 players · median €2.5M
Valued above 64% of the 1,583 attackers.
See them in the Explorer →Where Dia 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
- PolitanoRWSSC Napoli · Serie A€5M
- DybalaSSAS Roma · Serie A€5M
- MartínLBGenoa CFC · Serie A€5M
- CutroneCFParma Calcio 1913 · Serie A€5M
- WoodCFNottingham Forest · attackers€5M
- SaïdSSRC Lens · attackers€5M
- ThauvinRWRC Lens · attackers€5M
- DespodovRWPAOK Thessaloniki · attackers€5M
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).