Koen VanLangendonck

GKGoalkeeperGoalkeeper

Club: KVC Westerlo
League: Pro League
Nationality: Belgium
Age: 36
Height: 188 cm
Foot: Right
Valued: 4 Jun 2026

Reading the valuation

The market values Langendonck at €150k. Model A, which never saw Langendonck during training, estimates €68k: the market value is 122% above that estimate.

That is a factor of ×2.22. 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 €115k, closer to the market here, although it is usually further off (typical miss ×2.07).

A gap describes the model's arithmetic for this player's inputs, not what the player is worth.

Pitch length is a log value scale fitted to this player's figures. ● observed · ◇ Model A · dashed ◇ Model B · each arc is a residual, log(observed) − log(estimate).

Apps: 10
Minutes: 900
Started: 10/10
Min / app: 90
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 Langendonck…

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 €150k

Checking API

Asking 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 485 goalkeepers

Dashed ring: the goalkeeper median (50th percentile)

Starts

Share of appearances started rather than entered from the bench.

100% this player100% goalkeeper median62nd percentile

70%peer deciles · median line · this player ●100%

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; Sept 2012
Peak: €700k; Feb 2016
Model target: €150k; Jun 2026
Valuations: 29; 1 club change

Jun 2026€150kKVC WesterloValuation the model is trained to reproduce

Jun 2026: €150k, KVC Westerlo. Dotted lines mark the €2M, €10M and €30M tier boundaries.

Show as a table

Date	Market value	Club
2012-09-18	€100k	Beerschot AC (-2013)
2013-01-09	€200k	Beerschot AC (-2013)
2013-06-25	€200k	Beerschot AC (-2013)
2014-10-05	€500k	KVC Westerlo
2015-01-11	€600k	KVC Westerlo
2016-02-07	€700k	KVC Westerlo
2016-07-15	€700k	KVC Westerlo
2017-01-21	€700k	KVC Westerlo
2017-06-06	€700k	KVC Westerlo
2017-10-25	€600k	KVC Westerlo
2018-09-14	€500k	KVC Westerlo
2019-01-18	€500k	KVC Westerlo
2019-06-10	€500k	KVC Westerlo
2019-11-13	€400k	KVC Westerlo
2020-03-30	€350k	KVC Westerlo
2020-04-08	€300k	KVC Westerlo
2020-10-21	€200k	KVC Westerlo
2021-02-23	€125k	KVC Westerlo
2021-10-13	€100k	KVC Westerlo
2022-01-13	€100k	KVC Westerlo
2022-04-19	€100k	KVC Westerlo
2022-11-04	€100k	KVC Westerlo
2023-06-09	€100k	KVC Westerlo
2023-12-19	€100k	KVC Westerlo
2024-06-04	€100k	KVC Westerlo
2024-12-11	€150k	KVC Westerlo
2025-06-12	€150k	KVC Westerlo
2025-12-10	€150k	KVC Westerlo
2026-06-04	€150k	KVC Westerlo

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: +0.798

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 0% of the 350 Pro League players.

See them in the Explorer →

Goalkeepers, all leagues485 players · median €1M

Valued above 6% of the 485 goalkeepers.

See them in the Explorer →

Where Langendonck appears

TerminalPro League in the Player Explorer
TerminalPro League 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

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).