Kaj de Rooij
Value picture
Where the market, the likely price and the model estimates sit.
The model rates Kaj de Rooij's performance-implied value at EUR 0.4M-0.9M, below the estimated acquisition range of EUR 0.5M-1.5M. Its 24-month market value projection is EUR 0.6M-1.7M. Context-adjusted goal contributions are 1.41x the positional average in the league (2030 minutes, league coefficient 0.43). Confidence is medium: no event-level data (xG, progressive actions) is available from the current free source, and injury history is unavailable.
Bargain Index: 82
What drives the score. Not a black box: each component and its level.
| Performance | Below average | 14.5th pct among ATT peers (age-neutral) |
| Age | Neutral | 25.6 years |
| Acquisition cost | Favorable | est. €664k vs market €1.0M |
| Expected appreciation | Neutral | -7% over ~2 years (model) |
| Value gap | Negative | weak predictor on its own |
| Development | Low | |
| League translation | Uncertain | league coefficient 0.43 |
| Tactical fit | Not evaluated | Requires event/role data not available from the current free source. |
| Risk | Moderate | |
| Data confidence | Medium |
Bargain Index = percentile (among all evaluated players) of expected 2-year value relative to estimated cost. See methodology and backtests.
Market value history
Market value ≠ transfer fee ≠ acquisition cost.
Profile vs positional peers
Percentiles among 900 evaluated ATT players with 900+ minutes.
Performance (last season, league)
- Minutes
- 2030 (66% of available)
- Goals + assists / 90
- 0.49
- Context-adjusted G+A / 90
- 0.58
- xG, xA, progression
- Data unavailable
- Defensive actions
- Data unavailable
- Performance percentile
- 15 (Below average)
Adjusted = shrunk toward positional baseline for small samples, corrected for team dominance over opponents, expressed relative to positional peers in the same league.
Context
- League strength
- 0.43 (rank 15)
- Team strength (Elo)
- 1186
- Opponent strength
- 1309
- Possession, role
- Data unavailable
League strength 1.00 = average club of the big-five leagues. Elo includes continental matches.
Potential
- Development
- Low
- Trajectory
- insufficient
- Breakout probability
- Age > 23
- Resale range (24m)
- €584k – €1.7M
Historical comparables (8): median 2-year value change +0% (IQR -6% to +50%).
Risk profile
Overall: Moderate
- ⚠League level coefficient 0.43 (1.00 = big-five average): output may not translate.
- ⚠No continental-competition minutes last season.
- ⓘInjury history unavailable from current data source.
League translation
What happened to players who moved from this league to the big-five leagues (observed, not a forecast).
- Historical movers
- 82 (ATT)
- Relative output kept
- 73%–122%
- Held a regular role (900+ min)
- 61%
- Confidence
- Medium
Output is relative to positional peers in each league. Movers are a selected group (clubs buy players who fit), so treat this as context, not a guarantee.
Season-by-season (domestic league)
Context-adjusted values are model outputs.
| Season | Club | League | Pos | Apps | Min | Min share | G | A | G+A/90 | Adj. G+A/90 | Opp. Elo | Team Elo | League str. |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2025/26 | PEC Zwolle | Eredivisie | LW | 32 | 2030 | 66% | 6 | 5 | 0.49 | 0.58 | 1309 | 1186 | 0.43 |
| 2024/25 | PEC Zwolle | Eredivisie | LW | 21 | 309 | 10% | 2 | 1 | 0.87 | 0.65 | 1296 | 1265 | 0.50 |
| 2023/24 | PEC Zwolle | Eredivisie | LW | 5 | 163 | 5% | 0 | 0 | 0.00 | 0.35 | 1267 | 1189 | 0.48 |
Cups & continental competitions
| Season | Competition | Club | Apps | Min | G | A | Avg opp. Elo |
|---|---|---|---|---|---|---|---|
| 2025/26 | Knvb Beker | PEC Zwolle | 1 | 65 | 1 | 0 | — |
| 2024/25 | Knvb Beker | PEC Zwolle | 1 | 50 | 0 | 0 | — |
Small continental samples are shown for context only and are not over-weighted.
Historical comparables
Most similar profiles 2+ years ago (same position group) and what happened next. Chosen by similarity only — failures included.
| Player (then) | Age | Value then | ~2y later | Outcome |
|---|---|---|---|---|
| Lazaros Lamprou Super League 1 · 2022 | 25 | €1.0M | €750k | fell |
| Élie Youan Scottish Premiership · 2023 | 24 | €1.0M | €1.5M | rose |
| Theo Bair Scottish Premiership · 2024 | 25 | €1.0M | €1.5M | rose |
| Nicklas Helenius Superliga · 2017 | 26 | €600k | €600k | flat |
| Kaj Sierhuis Eredivisie · 2024 | 26 | €1.8M | €1.8M | flat |
| Nigel Hasselbaink Eredivisie · 2017 | 27 | €1.0M | €1.0M | flat |
| Dalibor Veselinovic Jupiler Pro League · 2014 | 27 | €900k | €700k | fell |
| Blair Spittal Scottish Premiership · 2022 | 27 | €450k | €850k | rose |
Transfer history
Fees as reported by the source; undisclosed fees shown as unknown, never estimated.
| Date | From | To | Fee | MV at time |
|---|---|---|---|---|
| 1 Jul 2026 | PEC Zwolle | Real Valladolid | Free / loan | €1.0M |
| 30 Jan 2024 | Without Club | PEC Zwolle | Unknown | €375k |
| 1 Jul 2023 | NAC Breda | Without Club | Unknown | €450k |
| 4 Oct 2020 | FC Eindhoven | NAC Breda | €475k | €475k |
| 1 Jul 2019 | Eindhoven U19 | FC Eindhoven | Unknown | €25k |
| 1 Jul 2017 | Eindhoven Yth.. | Eindhoven U19 | Unknown | Data unavailable |
| 1 Jul 2016 | Willem II Youth | Eindhoven Yth.. | Free / loan | Data unavailable |
| 1 Jul 2010 | Eindhoven Yth.. | Willem II/RKC Y. | Free / loan | Data unavailable |
| 1 Jul 2009 | Wilhelmina Yth. | Eindhoven Yth.. | Free / loan | Data unavailable |
MoneyballAI identifies statistical opportunities from available data. A player flagged as a potential bargain is not guaranteed to succeed, to transfer, to rise in value, or to generate resale profit. Market values, fees and contracts come from third-party sources; ranges are model estimates with stated confidence.