Chico
Lamba
CBPortugal · AS Saint-Étienne
Player dossierLigue 1
ChicoLamba
CBCentre-BackDefender
- Club
- AS Saint-Étienne
- League
- Ligue 1
- Nationality
- Portugal
- Age
- 22
- Height
- 190 cm
- Foot
- Right
- Valued
- 11 Dec 2025
Ligue 1Reading the valuation
The market values Lamba at €4M. Model A, which never saw Lamba during training, estimates €2.9M: the market value is 39% above that estimate.
That is a factor of ×1.39. 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 €2.3M, 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
- 26
- Minutes
- 2,265
- Goals
- 1
- Assists
- 1
- Started
- 25/26
- Min / app
- 87
- 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 Lamba…
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 €4M
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)
Starts
Share of appearances started rather than entered from the bench.
96% this player83% defender median87th 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
- €500k
- Nov 2022
- Peak
- €4M
- Oct 2025
- Model target
- €4M
- Dec 2025
- Valuations
- 7
- 2 club changes
Dec 2025: €4M, AS Saint-Étienne. Dotted lines mark the €2M, €10M and €30M tier boundaries.
Show as a table
| Date | Market value | Club |
|---|---|---|
| 2022-11-01 | €500k | Sporting CP B |
| 2024-01-17 | €500k | Sporting CP B |
| 2024-10-08 | €1.5M | FC Arouca |
| 2024-12-19 | €1.5M | FC Arouca |
| 2025-05-30 | €3M | FC Arouca |
| 2025-10-13 | €4M | AS Saint-Étienne |
| 2025-12-11 | €4M | AS Saint-Étienne |
Audit context group-level, not about this player
- Audit group
- UEFA
- Population gap, Model A
- +0.093 95% CI +0.063 to +0.124
- This player, market vs held-out A
- +0.330
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 →Ligue 1423 players · median €5M
Valued above 37% of the 423 Ligue 1 players.
See them in the Explorer →Defenders, all leagues2,065 players · median €2M
Valued above 65% of the 2,065 defenders.
See them in the Explorer →Where Lamba appears
- TerminalLigue 1 in the Player Explorer
- TerminalLigue 1 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
- TagliaficoLBOlympique Lyon · Ligue 1€4M
- ClaussRBOGC Nice · Ligue 1€4M
- DierCBAS Monaco · Ligue 1€4M
- ThomassonCMRC Lens · Ligue 1€4M
- KolasinacCBAtalanta BC · defenders€4M
- BurnCBNewcastle United · defenders€4M
- SchärCBNewcastle United · defenders€4M
- CarvajalRBReal Madrid · defenders€4M
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).