Christos
Sielis
CBCyprus · Panetolikos
Player dossierSuper League
ChristosSielis
CBCentre-BackDefender
- Club
- Panetolikos
- League
- Super League
- Nationality
- Cyprus
- Age
- 26
- Height
- 186 cm
- Foot
- Right
- Valued
- 4 Jun 2026
Super LeagueReading the valuation
The market values Sielis at €700k. Model A, which never saw Sielis during training, estimates €688k: the market value is 2% above that estimate.
That is a factor of ×1.02. 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 €1.4M, 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
- 47
- Minutes
- 3,958
- Goals
- 0
- Assists
- 1
- Started
- 45/47
- Min / app
- 84
- Cards
- 16Y 1R
Club matches, two years to the valuation date
The Valuation Journey
What moves Model A
Asking the prediction API to explain Model A for Sielis…
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 €700k
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)
Starts
Share of appearances started rather than entered from the bench.
96% this player83% defender median86th 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
- €100k
- Sept 2019
- Peak
- €800k
- May 2023
- Model target
- €700k
- Jun 2026
- Valuations
- 15
- 3 club changes
Jun 2026: €700k, Panetolikos. Dotted lines mark the €2M, €10M and €30M tier boundaries.
Show as a table
| Date | Market value | Club |
|---|---|---|
| 2019-09-24 | €100k | APOEL Nicosia |
| 2020-01-06 | €150k | APOEL Nicosia |
| 2020-10-06 | €200k | APOEL Nicosia |
| 2021-05-14 | €500k | APOEL Nicosia |
| 2021-12-08 | €500k | Levski Sofia |
| 2022-06-09 | €400k | Volos NFC |
| 2022-11-07 | €600k | Volos NFC |
| 2023-05-22 | €800k | Volos NFC |
| 2023-12-20 | €800k | Volos NFC |
| 2024-05-30 | €700k | Volos NFC |
| 2024-09-26 | €600k | Panetolikos |
| 2024-12-18 | €700k | Panetolikos |
| 2025-05-23 | €700k | Panetolikos |
| 2025-12-12 | €700k | Panetolikos |
| 2026-06-04 | €700k | Panetolikos |
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
- +0.017
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 →Super League356 players · median €600k
Valued above 55% of the 356 Super League players.
See them in the Explorer →Defenders, all leagues2,065 players · median €2M
Valued above 26% of the 2,065 defenders.
See them in the Explorer →Where Sielis appears
Watchlists and the comparison tray are kept in this browser only.
Near this valuation closest observed values: same league, then same position
- PereyraCMAEK Athens · Super League€700k
- UronenLBAtromitos Athens · Super League€700k
- BrignoliGKAEK Athens · Super League€700k
- GarcíaDMOlympiacos Piraeus · Super League€700k
- AlbiolCBPisa Sporting Club · defenders€700k
- D'AmbrosioCBAC Monza · defenders€700k
- FemeníaRBGetafe CF · defenders€700k
- AppiahRBAS Saint-Étienne · defenders€700k
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).