| Season | League | Apps | Min | Goals | Assists | G+A / 90 | Rating |
|---|---|---|---|---|---|---|---|
| — | 1. Liga | 1 | 86 | 0 | 0 | — | 7 |
| 2017/2018 | 1. Liga | 16 | 12 | 0 | 0 | — | — |
| 2019/2020 | Ekstraklasa | 3 | 37 | 0 | 0 | — | — |
| 2019/2020 | 1. Liga | 11 | 700 | 2 | 1 | 0.39 | — |
| 2020/2021 | Ekstraklasa | 6 | 114 | 1 | 1 | 1.58 | — |
| 2021/2022 | Ekstraklasa | 7 | 92 | 0 | 0 | 0 | 6.82 |
| 2022/2023 | Ekstraklasa | 13 | 153 | 2 | 0 | 1.18 | 6.81 |
| 2023/2024 | Eerste Divisie | 38 | 3216 | 16 | 6 | 0.62 | 7.24 |
| 2024/2025 | Eredivisie | 24 | 548 | 3 | 0 | 0.49 | 6.77 |
| 2025/2026 | Ekstraklasa | 10 | 201 | 0 | 0 | 0 | 6.48 |
| 2025/2026 | 1. Liga | 14 | 310 | 2 | 0 | 0.58 | 6.58 |
Domestic league competitions only (SportMonks sub_type='domestic'); national-team, continental and cup competitions are excluded. Classification resolved by league id against the canonical leagues index. G+A/90 computed from minutes actually played.
Figures computed from the GioScore season-stats database · as of 2026-07-27
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 |
2 goals in 14 games (310 minutes) — and no assists — was Kacper Kostorz's 2025/2026 1. Liga return — 0.58 goal involvements per 90. His average match rating for that season computes to 6.58.
His best-rated season remains 2023/2024 (7.24, Eerste Divisie); his lowest was 2025/2026 (6.48). His last two rated seasons average 0.38 below his earlier career level.
