Alex
Petkov
CBBulgaria · AE Kifisia
Player dossierSuper League
AlexPetkov
CBCentre-BackDefender
- Club
- AE Kifisia
- League
- Super League
- Nationality
- Bulgaria
- Age
- 26
- Height
- 193 cm
- Foot
- Right
- Valued
- 4 Jun 2026
Super LeagueReading the valuation
The market values Petkov at €600k. Model A, which never saw Petkov during training, estimates €771k: the market value is 22% below that estimate.
That is a factor of ×1.29. 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 €1.6M, 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
- 23
- Minutes
- 1,601
- Goals
- 1
- Assists
- 0
- Started
- 17/23
- Min / app
- 70
- 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 Petkov…
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)
European club minutes
Share of minutes played in UEFA club competitions.
22% this player0% defender median86th 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
- €200k
- Dec 2020
- Peak
- €1.8M
- Jun 2024
- Model target
- €600k
- Jun 2026
- Valuations
- 17
- 3 club changes
Jun 2026: €600k, AE Kifisia. Dotted lines mark the €2M, €10M and €30M tier boundaries.
Show as a table
| Date | Market value | Club |
|---|---|---|
| 2020-12-21 | €200k | Levski Sofia |
| 2021-06-17 | €400k | Arda Kardzhali |
| 2021-12-08 | €425k | Arda Kardzhali |
| 2022-05-31 | €400k | Arda Kardzhali |
| 2022-11-28 | €500k | Arda Kardzhali |
| 2023-03-03 | €600k | Arda Kardzhali |
| 2023-06-05 | €700k | Arda Kardzhali |
| 2023-10-06 | €900k | Slask Wroclaw |
| 2023-12-29 | €1.2M | Slask Wroclaw |
| 2024-03-28 | €1.5M | Slask Wroclaw |
| 2024-06-07 | €1.8M | Slask Wroclaw |
| 2024-09-20 | €1.5M | Slask Wroclaw |
| 2024-12-09 | €1M | Slask Wroclaw |
| 2025-04-03 | €800k | Slask Wroclaw |
| 2025-06-06 | €700k | Slask Wroclaw |
| 2025-12-12 | €600k | AE Kifisia |
| 2026-06-04 | €600k | AE Kifisia |
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
- −0.251
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 49% of the 356 Super 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 Petkov appears
Watchlists and the comparison tray are kept in this browser only.
Near this valuation closest observed values: same league, then same position
- SistoLWAE Larisa · Super League€600k
- BatubinsikaCBAE Larisa · Super League€600k
- KarachaliosDMOFI Crete · Super League€600k
- PokornyCBAE Kifisia · Super 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).