Gilles
Ruyssen
CBBelgium · KV Kortrijk
Player dossierPro League
GillesRuyssen
CBCentre-BackDefender
- Club
- KV Kortrijk
- League
- Pro League
- Nationality
- Belgium
- Age
- 31
- Height
- 186 cm
- Foot
- Right
- Valued
- 18 Dec 2025
Reading the valuation
The market values Ruyssen at €600k. Model A, which never saw Ruyssen during training, estimates €315k: the market value is 91% above that estimate.
That is a factor of ×1.91. 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 €308k, 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
- 28
- Minutes
- 2,480
- Goals
- 0
- Assists
- 0
- Started
- 28/28
- Min / app
- 89
- Cards
- 5Y 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 Ruyssen…
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 €600k
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.
100% this player83% defender median97th 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 2014
- Peak
- €600k
- Dec 2024
- Model target
- €600k
- Dec 2025
- Valuations
- 21
- 3 club changes
Dec 2025: €600k, KV Kortrijk. Dotted lines mark the €2M, €10M and €30M tier boundaries.
Show as a table
| Date | Market value | Club |
|---|---|---|
| 2014-10-05 | €50k | KVC Westerlo |
| 2015-01-11 | €200k | KVC Westerlo |
| 2015-10-22 | €500k | KVC Westerlo |
| 2016-02-07 | €500k | KVC Westerlo |
| 2016-07-15 | €400k | KVC Westerlo |
| 2017-01-21 | €400k | KVC Westerlo |
| 2017-06-06 | €350k | KVC Westerlo |
| 2020-08-20 | €150k | RWD Molenbeek |
| 2020-10-21 | €200k | RWD Molenbeek |
| 2021-02-23 | €400k | RWD Molenbeek |
| 2021-10-13 | €400k | RWD Molenbeek |
| 2022-01-13 | €400k | RWD Molenbeek |
| 2022-05-26 | €400k | RWD Molenbeek |
| 2022-12-22 | €300k | RWD Molenbeek |
| 2023-05-30 | €250k | FCV Dender EH |
| 2023-12-28 | €250k | FCV Dender EH |
| 2024-06-20 | €300k | FCV Dender EH |
| 2024-10-02 | €450k | FCV Dender EH |
| 2024-12-11 | €600k | FCV Dender EH |
| 2025-06-12 | €600k | FCV Dender EH |
| 2025-12-18 | €600k | KV Kortrijk |
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
- +0.645
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 →Pro League350 players · median €1.8M
Valued above 13% of the 350 Pro League players.
See them in the Explorer →Defenders, all leagues2,065 players · median €2M
Valued above 22% of the 2,065 defenders.
See them in the Explorer →Where Ruyssen appears
Watchlists and the comparison tray are kept in this browser only.
Near this valuation closest observed values: same league, then same position
- GallonGKFCV Dender EH · Pro League€600k
- BijlRBRoyal Antwerp FC · Pro League€600k
- NyssenRBZulte Waregem · Pro League€600k
- MaertensAMOud-Heverlee Leuven · Pro League€600k
- SilvestriRBBologna FC 1909 · defenders€600k
- JungCBSC Freiburg · defenders€600k
- TrimmelRB1.FC Union Berlin · defenders€600k
- BellCB1.FSV Mainz 05 · defenders€600k
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).