Niccolò
Fortini
LBItaly · ACF Fiorentina
Player dossierSerie A
NiccolòFortini
LBLeft-BackDefender
- Club
- ACF Fiorentina
- League
- Serie A
- Nationality
- Italy
- Age
- 20
- Height
- 185 cm
- Foot
- Right
- Valued
- 29 May 2026
Reading the valuation
The market values Fortini at €10M. Model A, which never saw Fortini during training, estimates €2.2M: the market value is 358% above that estimate.
That is a factor of ×4.58. 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 €507k, 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
- 17
- Minutes
- 620
- Goals
- 0
- Assists
- 0
- Started
- 3/17
- Min / app
- 36
- 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 Fortini…
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 €10M
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)
European club minutes
Share of minutes played in UEFA club competitions.
0% this player0% defender median30th 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
- €500k
- Jun 2024
- Peak
- €10M
- Dec 2025
- Model target
- €10M
- May 2026
- Valuations
- 7
- 2 club changes
May 2026: €10M, ACF Fiorentina. Dotted lines mark the €2M, €10M and €30M tier boundaries.
Show as a table
| Date | Market value | Club |
|---|---|---|
| 2024-06-25 | €500k | Fiorentina Primavera |
| 2024-10-15 | €1M | SS Juve Stabia |
| 2024-12-23 | €2M | SS Juve Stabia |
| 2025-03-17 | €3.5M | SS Juve Stabia |
| 2025-06-02 | €8.5M | SS Juve Stabia |
| 2025-12-23 | €10M | ACF Fiorentina |
| 2026-05-29 | €10M | ACF Fiorentina |
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
- +1.521
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 →Serie A507 players · median €5.5M
Valued above 65% of the 507 Serie A players.
See them in the Explorer →Defenders, all leagues2,065 players · median €2M
Valued above 81% of the 2,065 defenders.
See them in the Explorer →Where Fortini appears
- TerminalSerie A in the Player Explorer
- TerminalSerie A on the League Landscape
Watchlists and the comparison tray are kept in this browser only.
Near this valuation closest observed values: same league, then same position
- ZielinskiCMInter Milan · Serie A€10M
- LobotkaDMSSC Napoli · Serie A€10M
- RrahmaniCBSSC Napoli · Serie A€10M
- VlašićAMTorino FC · Serie A€10M
- FriedlCBSV Werder Bremen · defenders€10M
- ŠkriniarCBFenerbahce · defenders€10M
- LienhartCBSC Freiburg · defenders€10M
- Maitland-NilesRBOlympique Lyon · defenders€10M
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).