Mark
Mampassi
CBRussia · Lokomotiv Moscow
Player dossierPremier Liga
MarkMampassi
CBCentre-BackDefender
- Club
- Lokomotiv Moscow
- League
- Premier Liga
- Nationality
- Russia
- Age
- 22
- Height
- 185 cm
- Foot
- Right
- Valued
- 16 Dec 2025
Reading the valuation
The market values Mampassi at €400k. Model A, which never saw Mampassi during training, estimates €815k: the market value is 51% below that estimate.
That is a factor of ×2.04. 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 €765k, 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
- 24
- Minutes
- 1,763
- Goals
- 1
- Assists
- 1
- Started
- 20/24
- Min / app
- 73
- 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 Mampassi…
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 €400k
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)
Goals per 90
Club goals per 90 minutes played in the two years to the valuation date.
0.05 this player0.03 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
- €50k
- Jan 2021
- Peak
- €1.5M
- Jun 2022
- Model target
- €400k
- Dec 2025
- Valuations
- 13
- 5 club changes
Dec 2025: €400k, Lokomotiv Moscow. Dotted lines mark the €2M, €10M and €30M tier boundaries.
Show as a table
| Date | Market value | Club |
|---|---|---|
| 2021-01-14 | €50k | Shakhtar Donetsk U19 |
| 2021-06-07 | €200k | FC Mariupol |
| 2021-12-20 | €1M | FC Mariupol |
| 2022-06-02 | €1.5M | Lokomotiv Moscow |
| 2022-11-21 | €1.2M | Lokomotiv Moscow |
| 2023-03-14 | €1.2M | Antalyaspor |
| 2023-06-08 | €1M | Antalyaspor |
| 2023-12-19 | €800k | KV Kortrijk |
| 2024-03-22 | €600k | KV Kortrijk |
| 2024-06-04 | €800k | KV Kortrijk |
| 2024-12-11 | €700k | KV Kortrijk |
| 2025-06-12 | €500k | KV Kortrijk |
| 2025-12-16 | €400k | Lokomotiv Moscow |
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
- −0.711
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 →Premier Liga412 players · median €1M
Valued above 10% of the 412 Premier Liga players.
See them in the Explorer →Defenders, all leagues2,065 players · median €2M
Valued above 14% of the 2,065 defenders.
See them in the Explorer →Where Mampassi appears
Watchlists and the comparison tray are kept in this browser only.
Near this valuation closest observed values: same league, then same position
- KalinskiyDMFC Pari Nizhniy Novgorod · Premier Liga€400k
- KabutovRBRubin Kazan · Premier Liga€400k
- IljinCFFC Sochi · Premier Liga€400k
- KhubulovLWKrylya Sovetov Samara · Premier Liga€400k
- YoungRBIpswich Town · defenders€400k
- LovrenCBPAOK Thessaloniki · defenders€400k
- VogtCBVfL Bochum · defenders€400k
- SavicCBTrabzonspor · defenders€400k
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).