Lasse
Rieß
GKGermany · 1.FSV Mainz 05
Player dossierBundesliga
LasseRieß
GKGoalkeeperGoalkeeper
- Club
- 1.FSV Mainz 05
- League
- Bundesliga
- Nationality
- Germany
- Age
- 24
- Height
- 192 cm
- Foot
- Right
- Valued
- 27 May 2026
Reading the valuation
The market values Rieß at €500k. Model A, which never saw Rieß during training, estimates €1.5M: the market value is 67% below that estimate.
That is a factor of ×3.03. 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 €531k, 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
- 6
- Minutes
- 471
- Started
- 5/6
- Min / app
- 79
- Cards
- 0Y 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 Rieß…
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 €500k
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 485 goalkeepers
Dashed ring: the goalkeeper median (50th percentile)
European club minutes
Share of minutes played in UEFA club competitions.
0% this player0% goalkeeper median32nd 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
- €25k
- Sept 2020
- Peak
- €700k
- Dec 2025
- Model target
- €500k
- May 2026
- Valuations
- 15
- 1 club change
May 2026: €500k, 1.FSV Mainz 05. Dotted lines mark the €2M, €10M and €30M tier boundaries.
Show as a table
| Date | Market value | Club |
|---|---|---|
| 2020-09-15 | €25k | 1.FSV Mainz 05 II |
| 2021-02-15 | €50k | 1.FSV Mainz 05 II |
| 2021-06-30 | €100k | 1.FSV Mainz 05 II |
| 2021-12-22 | €100k | 1.FSV Mainz 05 |
| 2021-12-31 | €200k | 1.FSV Mainz 05 |
| 2022-06-09 | €200k | 1.FSV Mainz 05 |
| 2022-11-09 | €200k | 1.FSV Mainz 05 |
| 2023-06-22 | €200k | 1.FSV Mainz 05 |
| 2023-12-14 | €200k | 1.FSV Mainz 05 |
| 2024-05-29 | €200k | 1.FSV Mainz 05 |
| 2024-12-20 | €200k | 1.FSV Mainz 05 |
| 2025-06-05 | €400k | 1.FSV Mainz 05 |
| 2025-12-19 | €700k | 1.FSV Mainz 05 |
| 2026-03-20 | €500k | 1.FSV Mainz 05 |
| 2026-05-27 | €500k | 1.FSV Mainz 05 |
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
- −1.108
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 2% of the 451 Bundesliga players.
See them in the Explorer →Goalkeepers, all leagues485 players · median €1M
Valued above 27% of the 485 goalkeepers.
See them in the Explorer →Where Rieß appears
Watchlists and the comparison tray are kept in this browser only.
Near this valuation closest observed values: same league, then same position
- HöflerDMSC Freiburg · Bundesliga€500k
- WeinerGKHolstein Kiel · Bundesliga€500k
- JohanssonCBHolstein Kiel · Bundesliga€450k
- JungCBSC Freiburg · Bundesliga€600k
- GünokGKFenerbahce · goalkeepers€500k
- SteeleGKBrighton & Hove Albion · goalkeepers€500k
- DúbravkaGKBurnley FC · goalkeepers€500k
- SilvestriGKUS Cremonese · goalkeepers€500k
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).