Apostolos
Apostolopoulos
LBGreece · Panetolikos
Player dossierSuper League
ApostolosApostolopoulos
LBLeft-BackDefender
- Club
- Panetolikos
- League
- Super League
- Nationality
- Greece
- Age
- 23
- Height
- 179 cm
- Foot
- Left
- Valued
- 4 Jun 2026
Reading the valuation
The market values Apostolopoulos at €450k. Model A, which never saw Apostolopoulos during training, estimates €650k: the market value is 31% below that estimate.
That is a factor of ×1.44. 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 €1.1M, 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
- 24
- Minutes
- 1,322
- Goals
- 0
- Assists
- 0
- Started
- 17/24
- Min / app
- 55
- 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 Apostolopoulos…
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 €450k
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.
3% this player0% defender median64th 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
- Oct 2020
- Peak
- €600k
- Dec 2024
- Model target
- €450k
- Jun 2026
- Valuations
- 15
- 3 club changes
Jun 2026: €450k, Panetolikos. Dotted lines mark the €2M, €10M and €30M tier boundaries.
Show as a table
| Date | Market value | Club |
|---|---|---|
| 2020-10-12 | €150k | Olympiacos Piraeus U19 |
| 2021-02-12 | €150k | Olympiacos Piraeus U19 |
| 2021-11-01 | €150k | Olympiacos Piraeus B |
| 2022-02-22 | €300k | Olympiacos Piraeus B |
| 2022-06-27 | €300k | Olympiacos Piraeus B |
| 2023-02-27 | €300k | Olympiacos Piraeus B |
| 2023-06-19 | €300k | Olympiacos Piraeus B |
| 2023-12-28 | €300k | Olympiacos Piraeus B |
| 2024-05-23 | €400k | Olympiacos Piraeus B |
| 2024-09-26 | €500k | Olympiacos Piraeus |
| 2024-12-18 | €600k | Olympiacos Piraeus |
| 2025-03-14 | €500k | Panetolikos |
| 2025-05-23 | €500k | Panetolikos |
| 2025-12-12 | €450k | Panetolikos |
| 2026-06-04 | €450k | Panetolikos |
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
- −0.367
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 35% of the 356 Super League players.
See them in the Explorer →Defenders, all leagues2,065 players · median €2M
Valued above 17% of the 2,065 defenders.
See them in the Explorer →Where Apostolopoulos appears
Watchlists and the comparison tray are kept in this browser only.
Near this valuation closest observed values: same league, then same position
- MagnússonCBLevadiakos · Super League€450k
- OzegovicCFLevadiakos · Super League€450k
- DeligiannidisRBAsteras Aktor · Super League€450k
- KotsarisGKPanathinaikos · Super League€450k
- CresswellLBStoke City · defenders€450k
- GrétarssonCBSönderjyske Fodbold · defenders€450k
- JohanssonCBHolstein Kiel · defenders€450k
- VlietinckRBOud-Heverlee Leuven · defenders€450k
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).