| Season | League | Apps | Min | Goals | Assists | G+A / 90 | Rating |
|---|---|---|---|---|---|---|---|
| 2019/2020 | Ekstraklasa | 3 | 37 | 0 | 0 | — | — |
| 2019/2020 | 1. Liga | 15 | 1068 | 2 | 0 | 0.17 | — |
| 2020/2021 | Ekstraklasa | 6 | 112 | 1 | 1 | 1.61 | — |
| 2021/2022 | Ekstraklasa | 2 | 10 | 0 | 0 | — | 7 |
| 2022/2023 | Ekstraklasa | 1 | 16 | 0 | 0 | — | 6.4 |
| 2023/2024 | Eerste Divisie | 22 | 1861 | 1 | 2 | 0.15 | 7.27 |
| 2024/2025 | Eredivisie | 29 | 284 | 1 | 0 | 0.32 | 6.96 |
| 2025/2026 | Ekstraklasa | 4 | 66 | 0 | 0 | — | 6.64 |
Domestic league competitions only; G+A/90 computed from minutes actually played.
Cohort: 60 Eerste Divisie forwards, 2023/2024, min. 450 minutes. Computed by ranking the full league corpus, not taken from any feed.
Figures computed from the GioScore season-stats database · as of 2026-07-06
Player stats against each opponent club
| Team | MP | W | D | L | G | A | ||
|---|---|---|---|---|---|---|---|---|
 Willem II | 3 | 0 | 2 | 1 | 0 | 0 | 0 | 0 |
 FC Groningen | 3 | 0 | 1 | 2 | 1 | 0 | 0 | 0 |
 Feyenoord | 2 | 0 | 1 | 1 | 0 | 0 | 0 | 0 |
 Slavia Praha | 2 | 1 | 1 | 0 | 0 | 0 | 0 | 0 |
 Miedź Legnica | 2 | 1 | 1 | 0 | 0 | 0 | 0 | 0 |
 NEC Nijmegen | 2 | 1 | 0 | 1 | 0 | 0 | 0 | 0 |
 FC Twente | 2 | 1 | 0 | 1 | 0 | 0 | 0 | 0 |
 Napoli | 2 | 0 | 0 | 2 | 0 | 0 | 0 | 0 |
 Ajax | 2 | 1 | 0 | 1 | 0 | 0 | 0 | 0 |
 Dinamo Zagreb | 2 | 0 | 1 | 1 | 0 | 0 | 0 | 0 |
 PSV | 2 | 0 | 0 | 2 | 1 | 0 | 0 | 0 |
 FC Utrecht | 2 | 0 | 0 | 2 | 0 | 0 | 1 | 0 |
 RKC Waalwijk | 2 | 1 | 0 | 1 | 0 | 0 | 0 | 0 |
 Sparta Rotterdam | 2 | 1 | 1 | 0 | 0 | 0 | 0 | 0 |
 PEC Zwolle | 2 | 1 | 0 | 1 | 1 | 0 | 0 | 0 |
 Heracles Almelo | 2 | 0 | 1 | 1 | 0 | 0 | 0 | 0 |
 SC Cambuur | 2 | 1 | 0 | 1 | 1 | 0 | 0 | 0 |
 Fortuna Sittard | 2 | 1 | 0 | 1 | 1 | 0 | 0 | 0 |
 FC Emmen | 2 | 0 | 0 | 2 | 0 | 0 | 0 | 0 |
 Piast Gliwice | 2 | 1 | 0 | 1 | 0 | 0 | 1 | 0 |
All of Kacper Kostorz's 2024/2025 Eredivisie output came as goals: 1 goal in 29 games (284 minutes) — 0.32 goal involvements per 90. His average match rating for that season computes to 6.96. Among the 60 Eerste Divisie forwards who played 450+ minutes in 2023/2024, his match rating sits in the 88th percentile, above the median; on goals he ranks 19th of 60.
His best-rated season remains 2023/2024 (7.27, Eerste Divisie); his lowest was 2024/2025 (6.96).
| Club | Period | Apps | Goals | Assists | Minutes | YC | RC | Rating |
|---|---|---|---|---|---|---|---|---|
| NAC Breda | 2024/2025 | 31 | 3 | 0 | 453 | — | — | 6.69 |
| FC Den Bosch | 2023/2024 | 23 | 9 | 4 | 1951 | — | — | 6.86 |
| Pogoń Szczecin | 2021/2022 - 2025/2026 | 18 | 0 | 0 | 227 | — | — | 6.68 |
| Legia Warszawa | 2018/2019 - 2021/2022 | 16 | 2 | 1 | 289 | — | — | — |
| Polonia Warszawa | 2025/2026 - now | 15 | 2 | 0 | 282 | — | — | 6.46 |
| Miedź Legnica | 2019/2020 | 15 | 2 | 0 | 1068 | — | — | — |
| Total | 118 | 18 | 5 | 4270 |
| Season | Club | Apps | Goals | Assists | Minutes | YC | RC | Rating |
|---|---|---|---|---|---|---|---|---|
| 25/26 | Polonia Warszawa | 15 | 2 | — | 282 | 0 | 0 | 6.46 |
| 25/26 | Pogoń Szczecin | 15 | 0 | — | 201 | 1 | 0 | 6.64 |
| 24/25 | NAC Breda | 31 | 3 | — | 453 | 1 | 0 | 6.69 |
| 23/24 | FC Den Bosch | 23 | 9 | — | 1951 | 2 | 0 | 6.86 |
| 21/22 | Legia Warszawa | 5 | 1 | — | 56 | 0 | 0 | — |
| 20/21 | Legia Warszawa | 8 | 1 | — | 196 | 0 | 0 | — |
| 19/20 | Miedź Legnica | 15 | 2 | — | 1068 | 1 | 0 | — |
| 19/20 | Legia Warszawa | 3 | 0 | — | 37 | 1 | 0 | — |
