Gerald
Alders
RBNetherlands · SC Telstar
Player dossierEredivisie
GeraldAlders
RBRight-BackDefender
- Club
- SC Telstar
- League
- Eredivisie
- Nationality
- Netherlands
- Age
- 21
- Height
- 179 cm
- Foot
- Right
- Valued
- 28 May 2026
Reading the valuation
The market values Alders at €700k. Model A, which never saw Alders during training, estimates €852k: the market value is 18% below that estimate.
That is a factor of ×1.22. 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 €2.5M, 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
- 16
- Minutes
- 736
- Goals
- 0
- Assists
- 0
- Started
- 9/16
- Min / app
- 46
- Cards
- 0Y 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 Alders…
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 €700k
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.
6% this player0% defender median68th 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
- €150k
- Jan 2024
- Peak
- €700k
- Dec 2025
- Model target
- €700k
- May 2026
- Valuations
- 8
- 4 club changes
May 2026: €700k, SC Telstar. Dotted lines mark the €2M, €10M and €30M tier boundaries.
Show as a table
| Date | Market value | Club |
|---|---|---|
| 2024-01-08 | €150k | Ajax U18 |
| 2024-06-10 | €200k | Ajax U18 |
| 2024-10-14 | €275k | Ajax Amsterdam U21 |
| 2024-12-10 | €275k | Ajax Amsterdam U21 |
| 2025-05-28 | €275k | FC Twente Enschede |
| 2025-10-16 | €350k | Ajax Amsterdam U21 |
| 2025-12-16 | €700k | Ajax Amsterdam U21 |
| 2026-05-28 | €700k | SC Telstar |
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
- −0.197
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 →Eredivisie425 players · median €1M
Valued above 34% of the 425 Eredivisie players.
See them in the Explorer →Defenders, all leagues2,065 players · median €2M
Valued above 26% of the 2,065 defenders.
See them in the Explorer →Where Alders appears
Watchlists and the comparison tray are kept in this browser only.
Near this valuation closest observed values: same league, then same position
- DasaCBNEC Nijmegen · Eredivisie€700k
- OuwejanCBNEC Nijmegen · Eredivisie€700k
- VerschuerenAMFC Twente Enschede · Eredivisie€700k
- Ronald Koeman Jr.GKSC Telstar · Eredivisie€700k
- AlbiolCBPisa Sporting Club · defenders€700k
- D'AmbrosioCBAC Monza · defenders€700k
- FemeníaRBGetafe CF · defenders€700k
- AppiahRBAS Saint-Étienne · defenders€700k
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).