Sayfallah
Ltaief
LMTunisia · Sparta Rotterdam
Player dossierEredivisie
SayfallahLtaief
LMLeft MidfieldMidfield
- Club
- Sparta Rotterdam
- League
- Eredivisie
- Nationality
- Tunisia
- Age
- 25
- Height
- 178 cm
- Foot
- Right
- Valued
- 2 Dec 2025
EredivisieReading the valuation
The market values Ltaief at €1.3M. Model A, which never saw Ltaief during training, estimates €2M: the market value is 33% below that estimate.
That is a factor of ×1.50. 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 €4.2M, 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
- 53
- Minutes
- 2,396
- Goals
- 4
- Assists
- 2
- Started
- 25/53
- Min / app
- 45
- 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 Ltaief…
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 €1.3M
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 1,687 midfielders
Dashed ring: the midfielder median (50th percentile)
European club minutes
Share of minutes played in UEFA club competitions.
22% this player0% midfielder median87th 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
- Jul 2020
- Peak
- €2M
- May 2024
- Model target
- €1.3M
- Dec 2025
- Valuations
- 16
- 4 club changes
Dec 2025: €1.3M, Sparta Rotterdam. Dotted lines mark the €2M, €10M and €30M tier boundaries.
Show as a table
| Date | Market value | Club |
|---|---|---|
| 2020-07-31 | €200k | FC Winterthur |
| 2021-01-12 | €400k | FC Winterthur |
| 2021-04-21 | €300k | FC Winterthur |
| 2021-06-23 | €300k | FC Winterthur |
| 2022-01-03 | €200k | FC Winterthur |
| 2022-06-08 | €350k | FC Winterthur |
| 2022-11-10 | €350k | FC Basel 1893 |
| 2023-03-28 | €400k | FC Winterthur |
| 2023-06-07 | €400k | FC Winterthur |
| 2023-10-19 | €700k | FC Winterthur |
| 2023-12-21 | €1M | FC Winterthur |
| 2024-03-28 | €1.5M | FC Winterthur |
| 2024-05-31 | €2M | FC Winterthur |
| 2024-12-17 | €2M | FC Twente Enschede |
| 2025-05-28 | €1.8M | FC Twente Enschede |
| 2025-12-02 | €1.3M | Sparta Rotterdam |
Audit context group-level, not about this player
- Audit group
- non-UEFA
- Population gap, Model A
- +0.093 95% CI +0.063 to +0.124
- This player, market vs held-out A
- −0.406
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 →Eredivisie425 players · median €1M
Valued above 52% of the 425 Eredivisie players.
See them in the Explorer →Midfielders, all leagues1,687 players · median €2M
Valued above 38% of the 1,687 midfielders.
See them in the Explorer →Where Ltaief appears
Watchlists and the comparison tray are kept in this browser only.
Near this valuation closest observed values: same league, then same position
- RenteRBFC Groningen · Eredivisie€1.3M
- LimniosRWFortuna Sittard · Eredivisie€1.3M
- SamboRBSparta Rotterdam · Eredivisie€1.3M
- EerdhuijzenCBFC Utrecht · Eredivisie€1.3M
- GagliardiniCMHellas Verona · midfielders€1.3M
- YahDMFC Volendam · midfielders€1.3M
- BuurmeesterCMPEC Zwolle · midfielders€1.3M
- KhalifiCMRoyal Charleroi SC · midfielders€1.3M
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).