Isa
Sakamoto
AMJapan · KVC Westerlo
Player dossierPro League
IsaSakamoto
AMAttacking MidfieldMidfield
- Club
- KVC Westerlo
- League
- Pro League
- Nationality
- Japan
- Age
- 22
- Height
- 173 cm
- Foot
- Right
- Valued
- 4 Jun 2026
Pro LeagueReading the valuation
The market values Sakamoto at €4M. Model A, which never saw Sakamoto during training, estimates €6.8M: the market value is 41% below that estimate.
That is a factor of ×1.69. 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 €4.1M, 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
- 47
- Minutes
- 3,695
- Goals
- 9
- Assists
- 6
- Started
- 46/47
- Min / app
- 79
- Cards
- 3Y 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 Sakamoto…
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 €4M
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)
Starts
Share of appearances started rather than entered from the bench.
98% this player69% midfielder 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
- €50k
- Jan 2020
- Peak
- €4M
- Jun 2026
- Model target
- €4M
- Jun 2026
- Valuations
- 14
- 4 club changes
Jun 2026: €4M, KVC Westerlo. Dotted lines mark the €2M, €10M and €30M tier boundaries.
Show as a table
| Date | Market value | Club |
|---|---|---|
| 2020-01-25 | €50k | Unknown |
| 2021-06-29 | €50k | Unknown |
| 2022-01-14 | €50k | Unknown |
| 2022-06-28 | €100k | Gamba Osaka |
| 2023-01-06 | €150k | Gamba Osaka |
| 2023-06-27 | €150k | Fagiano Okayama |
| 2024-02-22 | €300k | Gamba Osaka |
| 2024-06-12 | €600k | Gamba Osaka |
| 2024-12-10 | €700k | Gamba Osaka |
| 2025-03-26 | €1.3M | KVC Westerlo |
| 2025-06-12 | €2.5M | KVC Westerlo |
| 2025-10-01 | €3.5M | KVC Westerlo |
| 2025-12-10 | €3.5M | KVC Westerlo |
| 2026-06-04 | €4M | KVC Westerlo |
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
- −0.524
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 →Pro League350 players · median €1.8M
Valued above 78% of the 350 Pro League players.
See them in the Explorer →Midfielders, all leagues1,687 players · median €2M
Valued above 61% of the 1,687 midfielders.
See them in the Explorer →Where Sakamoto appears
Watchlists and the comparison tray are kept in this browser only.
Near this valuation closest observed values: same league, then same position
- JanssenCFRoyal Antwerp FC · Pro League€4M
- BertacciniCFRSC Anderlecht · Pro League€4M
- SkorasLWKAA Gent · Pro League€4M
- SikanCFRSC Anderlecht · Pro League€4M
- BarkleyCMAston Villa · midfielders€4M
- EndoDMLiverpool FC · midfielders€4M
- ThomassonCMRC Lens · midfielders€4M
- KarlströmDMUdinese Calcio · midfielders€4M
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).