Jarell
Quansah
CBEngland · Bayer 04 Leverkusen
Image: FootyLogos
Player dossierBundesliga
JarellQuansah
CBCentre-BackDefender
- Club
- Bayer 04 Leverkusen
- League
- Bundesliga
- Nationality
- England
- Age
- 23
- Height
- 190 cm
- Foot
- Right
- Valued
- 27 May 2026
BundesligaReading the valuation
The market values Quansah at €45M. Model A, which never saw Quansah during training, estimates €28.2M: the market value is 59% above that estimate.
That is a factor of ×1.59. 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 €15.8M, 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
- 63
- Minutes
- 4,603
- Goals
- 5
- Assists
- 0
- Started
- 48/63
- Min / app
- 73
- Cards
- 11Y 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 Quansah…
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 €45M
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)
Minutes, last 365 days
Club minutes in the final year of the window: recent involvement, or the absence of it.
3,706 this player1,687 defender median98th 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
- €400k
- Apr 2023
- Peak
- €45M
- Mar 2026
- Model target
- €45M
- May 2026
- Valuations
- 11
- 2 club changes
May 2026: €45M, Bayer 04 Leverkusen. Dotted lines mark the €2M, €10M and €30M tier boundaries.
Show as a table
| Date | Market value | Club |
|---|---|---|
| 2023-04-05 | €400k | Bristol Rovers |
| 2023-10-09 | €2M | Liverpool FC |
| 2023-12-19 | €6M | Liverpool FC |
| 2024-03-14 | €12M | Liverpool FC |
| 2024-05-27 | €22M | Liverpool FC |
| 2024-12-16 | €22M | Liverpool FC |
| 2025-05-30 | €20M | Liverpool FC |
| 2025-10-14 | €35M | Bayer 04 Leverkusen |
| 2025-12-19 | €40M | Bayer 04 Leverkusen |
| 2026-03-20 | €45M | Bayer 04 Leverkusen |
| 2026-05-27 | €45M | Bayer 04 Leverkusen |
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
- +0.466
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 →Bundesliga451 players · median €5M
Valued above 96% of the 451 Bundesliga players.
See them in the Explorer →Defenders, all leagues2,065 players · median €2M
Valued above 98% of the 2,065 defenders.
See them in the Explorer →Where Quansah appears
Watchlists and the comparison tray are kept in this browser only.
Near this valuation closest observed values: same league, then same position
- StillerDMVfB Stuttgart · Bundesliga€45M
- UzunAMEintracht Frankfurt · Bundesliga€45M
- MazaAMBayer 04 Leverkusen · Bundesliga€45M
- MalaLW1.FC Köln · Bundesliga€45M
- RomeroCBTottenham Hotspur · defenders€45M
- KonatéCBLiverpool FC · defenders€45M
- LivramentoRBNewcastle United · defenders€45M
- ThiawCBNewcastle United · defenders€45M
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).