Jakub
Brabec
CBCzech Republic · Rio Ave FC
Player dossierLiga Portugal
JakubBrabec
CBCentre-BackDefender
- Club
- Rio Ave FC
- League
- Liga Portugal
- Nationality
- Czech Republic
- Age
- 33
- Height
- 186 cm
- Foot
- Right
- Valued
- 28 May 2026
Liga PortugalReading the valuation
The market values Brabec at €400k. Model A, which never saw Brabec during training, estimates €451k: the market value is 11% below that estimate.
That is a factor of ×1.13. 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 €853k, 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
- 52
- Minutes
- 4,389
- Goals
- 2
- Assists
- 0
- Started
- 48/52
- Min / app
- 84
- Cards
- 10Y 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 Brabec…
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 €400k
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.
92% this player83% defender median77th 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
- Aug 2011
- Peak
- €3M
- Dec 2019
- Model target
- €400k
- May 2026
- Valuations
- 36
- 6 club changes
May 2026: €400k, Rio Ave FC. Dotted lines mark the €2M, €10M and €30M tier boundaries.
Show as a table
| Date | Market value | Club |
|---|---|---|
| 2011-08-12 | €200k | AC Sparta Prague B |
| 2011-08-18 | €300k | AC Sparta Prague B |
| 2012-02-05 | €300k | AC Sparta Prague |
| 2012-03-25 | €700k | AC Sparta Prague |
| 2012-08-02 | €700k | AC Sparta Prague |
| 2013-07-25 | €700k | AC Sparta Prague |
| 2013-12-27 | €1M | AC Sparta Prague |
| 2014-09-03 | €1M | AC Sparta Prague |
| 2015-01-17 | €1M | AC Sparta Prague |
| 2015-10-14 | €1M | AC Sparta Prague |
| 2016-03-18 | €1.8M | AC Sparta Prague |
| 2016-08-03 | €2.5M | AC Sparta Prague |
| 2017-01-21 | €2.5M | KRC Genk |
| 2017-06-06 | €2.5M | KRC Genk |
| 2018-01-09 | €2.2M | KRC Genk |
| 2018-03-30 | €2M | KRC Genk |
| 2018-06-03 | €1.8M | KRC Genk |
| 2019-01-04 | €1.8M | Caykur Rizespor |
| 2019-06-25 | €2M | FC Viktoria Plzen |
| 2019-09-25 | €2.2M | FC Viktoria Plzen |
| 2019-12-07 | €3M | FC Viktoria Plzen |
| 2020-04-08 | €2.4M | FC Viktoria Plzen |
| 2020-07-10 | €2.5M | FC Viktoria Plzen |
| 2020-12-27 | €2.5M | FC Viktoria Plzen |
| 2021-05-28 | €2.2M | FC Viktoria Plzen |
| 2021-11-01 | €2M | Aris Thessaloniki |
| 2022-06-09 | €2M | Aris Thessaloniki |
| 2022-11-07 | €2M | Aris Thessaloniki |
| 2023-05-22 | €2M | Aris Thessaloniki |
| 2023-12-20 | €2M | Aris Thessaloniki |
| 2024-05-30 | €1.8M | Aris Thessaloniki |
| 2024-09-26 | €1.5M | Aris Thessaloniki |
| 2024-12-18 | €1.2M | Aris Thessaloniki |
| 2025-05-23 | €1M | Aris Thessaloniki |
| 2025-12-18 | €600k | Rio Ave FC |
| 2026-05-28 | €400k | Rio Ave FC |
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
- −0.120
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 →Liga Portugal423 players · median €1M
Valued above 12% of the 423 Liga Portugal players.
See them in the Explorer →Defenders, all leagues2,065 players · median €2M
Valued above 14% of the 2,065 defenders.
See them in the Explorer →Where Brabec appears
Watchlists and the comparison tray are kept in this browser only.
Near this valuation closest observed values: same league, then same position
- OliveiraCBSC Braga · Liga Portugal€400k
- AbascalCBVitória Guimarães SC · Liga Portugal€400k
- GualCFRio Ave FC · Liga Portugal€400k
- NóbregaCBVitória Guimarães SC · Liga Portugal€400k
- YoungRBIpswich Town · defenders€400k
- LovrenCBPAOK Thessaloniki · defenders€400k
- VogtCBVfL Bochum · defenders€400k
- SavicCBTrabzonspor · defenders€400k
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).