Alexander
Callens
CBPeru · AEK Athens
Player dossierSuper League
AlexanderCallens
CBCentre-BackDefender
- Club
- AEK Athens
- League
- Super League
- Nationality
- Peru
- Age
- 34
- Height
- 186 cm
- Foot
- Left
- Valued
- 4 Jun 2026
Super LeagueReading the valuation
The market values Callens at €200k. Model A, which never saw Callens during training, estimates €445k: the market value is 55% below that estimate.
That is a factor of ×2.23. 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 €428k, 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.
- Apps
- 11
- Minutes
- 826
- Goals
- 0
- Assists
- 0
- Started
- 9/11
- Min / app
- 75
- Cards
- 1Y 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 Callens…
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 €200k
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.
31% this player0% defender median96th 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
- €300k
- Sept 2015
- Peak
- €2.2M
- Jul 2021
- Model target
- €200k
- Jun 2026
- Valuations
- 26
- 3 club changes
Jun 2026: €200k, AEK Athens. Dotted lines mark the €2M, €10M and €30M tier boundaries.
Show as a table
| Date | Market value | Club |
|---|---|---|
| 2015-09-08 | €300k | CD Numancia |
| 2016-02-22 | €300k | CD Numancia |
| 2016-07-15 | €400k | CD Numancia |
| 2017-03-04 | €400k | New York City FC |
| 2017-05-24 | €650k | New York City FC |
| 2017-12-05 | €800k | New York City FC |
| 2018-05-02 | €850k | New York City FC |
| 2018-12-15 | €1M | New York City FC |
| 2019-05-27 | €1M | New York City FC |
| 2019-11-30 | €1.2M | New York City FC |
| 2020-04-08 | €950k | New York City FC |
| 2020-08-26 | €1.2M | New York City FC |
| 2020-12-18 | €1.8M | New York City FC |
| 2021-06-11 | €1.8M | New York City FC |
| 2021-07-09 | €2.2M | New York City FC |
| 2021-11-09 | €2.2M | New York City FC |
| 2022-08-18 | €2M | New York City FC |
| 2022-11-08 | €2M | New York City FC |
| 2023-06-13 | €1.8M | Girona FC |
| 2023-12-20 | €1.5M | AEK Athens |
| 2024-05-30 | €1.2M | AEK Athens |
| 2024-12-18 | €1M | AEK Athens |
| 2025-05-23 | €800k | AEK Athens |
| 2025-09-23 | €600k | AEK Athens |
| 2025-12-12 | €300k | AEK Athens |
| 2026-06-04 | €200k | AEK Athens |
Audit context group-level, not about this player
- Audit group
- non-UEFA
- Population gap, Model A
- +0.093 95% CI +0.063 to +0.124
- This player, market vs held-out A
- −0.800
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 →Super League356 players · median €600k
Valued above 10% of the 356 Super League players.
See them in the Explorer →Defenders, all leagues2,065 players · median €2M
Valued above 5% of the 2,065 defenders.
See them in the Explorer →Where Callens appears
Watchlists and the comparison tray are kept in this browser only.
Near this valuation closest observed values: same league, then same position
- LoukinasCFNiki Volou · Super League€200k
- VillafañezAMAE Kifisia · Super League€200k
- GianniotasRWAris Thessaloniki · Super League€200k
- FrydekLBAris Thessaloniki · Super League€200k
- CaroleLBKayserispor · defenders€200k
- ZankaCBFC Copenhagen · defenders€200k
- BambaCBAngers SCO · defenders€200k
- ColemanRBEverton FC · defenders€200k
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).