Konstantinos
Triantafyllopoulos
CBGreece · Asteras Aktor
Player dossierSuper League
KonstantinosTriantafyllopoulos
CBCentre-BackDefender
- Club
- Asteras Aktor
- League
- Super League
- Nationality
- Greece
- Age
- 33
- Height
- 185 cm
- Foot
- Right
- Valued
- 4 Jun 2026
Reading the valuation
The market values Triantafyllopoulos at €175k. Model A, which never saw Triantafyllopoulos during training, estimates €249k: the market value is 30% below that estimate.
That is a factor of ×1.42. 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 €362k, 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
- 46
- Minutes
- 3,692
- Goals
- 1
- Assists
- 1
- Started
- 41/46
- Min / app
- 80
- Cards
- 8Y 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 Triantafyllopoulos…
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 €175k
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.
89% this player83% defender median67th 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
- €150k
- Jul 2012
- Peak
- €1.8M
- Apr 2022
- Model target
- €175k
- Jun 2026
- Valuations
- 37
- 4 club changes
Jun 2026: €175k, Asteras Aktor. Dotted lines mark the €2M, €10M and €30M tier boundaries.
Show as a table
| Date | Market value | Club |
|---|---|---|
| 2012-07-12 | €150k | Panathinaikos |
| 2012-08-26 | €250k | Panathinaikos |
| 2012-09-21 | €250k | Panathinaikos |
| 2013-02-10 | €450k | Panathinaikos |
| 2013-12-02 | €750k | Panathinaikos |
| 2014-03-28 | €1M | Panathinaikos |
| 2014-11-11 | €1M | Panathinaikos |
| 2015-05-10 | €1.3M | Panathinaikos |
| 2015-09-27 | €1M | Panathinaikos |
| 2016-02-21 | €800k | Asteras Tripolis |
| 2016-06-21 | €600k | Asteras Tripolis |
| 2016-12-21 | €450k | Asteras Tripolis |
| 2017-05-11 | €450k | Asteras Tripolis |
| 2017-12-18 | €500k | Asteras Tripolis |
| 2018-05-22 | €700k | Asteras Tripolis |
| 2018-12-07 | €600k | Asteras Tripolis |
| 2019-05-21 | €500k | Asteras Tripolis |
| 2020-01-15 | €750k | Pogon Szczecin |
| 2020-04-08 | €600k | Pogon Szczecin |
| 2020-08-18 | €750k | Pogon Szczecin |
| 2021-01-19 | €750k | Pogon Szczecin |
| 2021-05-21 | €850k | Pogon Szczecin |
| 2021-10-15 | €1M | Pogon Szczecin |
| 2021-12-31 | €1.5M | Pogon Szczecin |
| 2022-04-07 | €1.8M | Pogon Szczecin |
| 2022-06-14 | €1.8M | Pogon Szczecin |
| 2022-09-29 | €1.5M | Pogon Szczecin |
| 2022-11-16 | €800k | Pogon Szczecin |
| 2023-06-09 | €600k | Pogon Szczecin |
| 2023-10-06 | €450k | Górnik Zabrze |
| 2023-12-29 | €300k | Górnik Zabrze |
| 2024-03-28 | €200k | Górnik Zabrze |
| 2024-06-07 | €200k | Górnik Zabrze |
| 2024-12-18 | €200k | Asteras Aktor |
| 2025-05-23 | €200k | Asteras Aktor |
| 2025-12-12 | €200k | Asteras Aktor |
| 2026-06-04 | €175k | Asteras Aktor |
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
- −0.351
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 8% of the 356 Super League players.
See them in the Explorer →Defenders, all leagues2,065 players · median €2M
Valued above 5% of the 2,065 defenders.
See them in the Explorer →Where Triantafyllopoulos appears
Watchlists and the comparison tray are kept in this browser only.
Near this valuation closest observed values: same league, then same position
- TzandarisDMAsteras Aktor · Super League€175k
- MusiolikCFAE Kifisia · Super League€175k
- DentakisRBAthens Kallithea · Super League€175k
- GaravelisGKNiki Volou · Super League€175k
- RandallRBRoss County FC · defenders€175k
- MilaniLBHeracles Almelo · defenders€175k
- BenedyukRBIngulets Petrove · defenders€175k
- PomonisLBAsteras Aktor · defenders€175k
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).