Nicolás
Fonseca
DMUruguay · Real Oviedo
Player dossierLaLiga
NicolásFonseca
DMDefensive MidfieldMidfield
- Club
- Real Oviedo
- League
- LaLiga
- Nationality
- Uruguay
- Age
- 27
- Height
- 181 cm
- Foot
- Right
- Valued
- 5 Jun 2026
LaLigaReading the valuation
The market values Fonseca at €3M. Model A, which never saw Fonseca during training, estimates €1.3M: the market value is 124% above that estimate.
That is a factor of ×2.24. 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.
- Apps
- 19
- Minutes
- 1,020
- Goals
- 0
- Assists
- 0
- Started
- 12/19
- Min / app
- 54
- Cards
- 6Y 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 Fonseca…
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 €3M
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 1,687 midfielders
Dashed ring: the midfielder median (50th percentile)
Starts
Share of appearances started rather than entered from the bench.
63% this player69% midfielder median39th 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
- €50k
- Oct 2016
- Peak
- €3.5M
- Mar 2025
- Model target
- €3M
- Jun 2026
- Valuations
- 18
- 6 club changes
Jun 2026: €3M, Real Oviedo. Dotted lines mark the €2M, €10M and €30M tier boundaries.
Show as a table
| Date | Market value | Club |
|---|---|---|
| 2016-10-17 | €50k | Novara Primavera |
| 2017-05-16 | €25k | Novara Primavera |
| 2018-06-30 | €50k | Novara Primavera |
| 2018-12-13 | €50k | Novara Calcio 1908 |
| 2019-06-19 | €75k | Novara Calcio 1908 |
| 2019-12-16 | €75k | Novara Calcio 1908 |
| 2022-06-02 | €125k | CA River Plate Montevideo |
| 2022-11-12 | €275k | Montevideo Wanderers |
| 2023-04-03 | €400k | Montevideo Wanderers |
| 2023-07-10 | €550k | Montevideo Wanderers |
| 2023-10-02 | €2.5M | Montevideo Wanderers |
| 2023-12-28 | €2.5M | Montevideo Wanderers |
| 2024-06-12 | €3M | CA River Plate |
| 2024-12-13 | €2.7M | CA River Plate |
| 2025-03-31 | €3.5M | Club León FC |
| 2025-05-26 | €3.5M | Club León FC |
| 2025-12-29 | €3M | Club León FC |
| 2026-06-05 | €3M | Real Oviedo |
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
- +0.808
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 →Midfielders, all leagues1,687 players · median €2M
Valued above 56% of the 1,687 midfielders.
See them in the Explorer →Where Fonseca appears
- TerminalLaLiga in the Player Explorer
- TerminalLaLiga 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
- AlabaCBReal Madrid · LaLiga€3M
- StegenGKGirona FC · LaLiga€3M
- VlachodimosGKSevilla FC · LaLiga€3M
- DarderCMRCD Mallorca · LaLiga€3M
- MkhitaryanCMInter Milan · midfielders€3M
- GötzeAMEintracht Frankfurt · midfielders€3M
- AndréDMLOSC Lille · midfielders€3M
- ArnoldCMVfL Wolfsburg · midfielders€3M
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).