Sydney van
Hooijdonk
CFNetherlands · CF Estrela Amadora
Player dossierLiga Portugal
Sydney vanHooijdonk
CFCentre-ForwardAttack
- Club
- CF Estrela Amadora
- League
- Liga Portugal
- Nationality
- Netherlands
- Age
- 26
- Height
- 190 cm
- Foot
- Right
- Valued
- 28 May 2026
Liga PortugalReading the valuation
The market values Hooijdonk at €1M. Model A, which never saw Hooijdonk during training, estimates €985k: the market value is 1% above that estimate.
That is a factor of ×1.01. 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 €1.4M, 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
- 48
- Minutes
- 2,792
- Goals
- 7
- Assists
- 2
- Started
- 32/48
- Min / app
- 58
- Cards
- 3Y 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 Hooijdonk…
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 €1M
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)
Starts
Share of appearances started rather than entered from the bench.
67% this player59% attacker median63rd 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
- €100k
- Oct 2018
- Peak
- €6M
- Jun 2023
- Model target
- €1M
- May 2026
- Valuations
- 21
- 7 club changes
May 2026: €1M, CF Estrela Amadora. Dotted lines mark the €2M, €10M and €30M tier boundaries.
Show as a table
| Date | Market value | Club |
|---|---|---|
| 2018-10-04 | €100k | NAC Breda |
| 2018-12-28 | €150k | NAC Breda |
| 2019-06-12 | €200k | NAC Breda |
| 2020-01-17 | €250k | NAC Breda |
| 2020-06-29 | €275k | NAC Breda |
| 2020-10-24 | €400k | NAC Breda |
| 2020-12-31 | €500k | NAC Breda |
| 2021-10-14 | €800k | Bologna FC 1909 |
| 2021-12-28 | €800k | Bologna FC 1909 |
| 2022-06-08 | €1.3M | SC Heerenveen |
| 2022-09-14 | €2.3M | SC Heerenveen |
| 2022-11-11 | €3M | SC Heerenveen |
| 2023-06-23 | €6M | SC Heerenveen |
| 2023-12-20 | €5M | Bologna FC 1909 |
| 2024-05-24 | €4M | Norwich City |
| 2024-10-15 | €2.5M | Cesena FC |
| 2024-12-23 | €1.7M | Cesena FC |
| 2025-03-28 | €1.3M | NAC Breda |
| 2025-05-28 | €1M | NAC Breda |
| 2025-12-02 | €1.3M | NAC Breda |
| 2026-05-28 | €1M | CF Estrela Amadora |
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
- +0.015
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
Valued above 42% of the 423 Liga Portugal players.
See them in the Explorer →Attackers, all leagues1,583 players · median €2.5M
Valued above 29% of the 1,583 attackers.
See them in the Explorer →Where Hooijdonk appears
Watchlists and the comparison tray are kept in this browser only.
Near this valuation closest observed values: same league, then same position
- OtamendiCBSL Benfica · Liga Portugal€1M
- SoaresLBFC Famalicão · Liga Portugal€1M
- ZlobinGKFC Famalicão · Liga Portugal€1M
- FerroCBGD Estoril Praia · Liga Portugal€1M
- DzekoCFFC Schalke 04 · attackers€1M
- DzyubaCFAkron Tolyatti · attackers€1M
- PedroRWSS Lazio · attackers€1M
- DjuricCFUS Cremonese · attackers€1M
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).