| Season | League | Apps | Min | Goals | Assists | G+A / 90 | Rating |
|---|---|---|---|---|---|---|---|
| 2016/2017 | Ekstraklasa | 5 | 139 | 0 | 0 | 0 | — |
| 2017/2018 | Ekstraklasa | 7 | 180 | 0 | 0 | 0 | — |
| 2018/2019 | Ekstraklasa | 28 | 1595 | 2 | 3 | 0.28 | — |
| 2019/2020 | Ekstraklasa | 35 | 3025 | 2 | 2 | 0.12 | — |
| 2020/2021 | Ekstraklasa | 29 | 2114 | 3 | 0 | 0.13 | — |
| 2021/2022 | Ekstraklasa | 30 | 1990 | 6 | 4 | 0.45 | 7.16 |
| 2022/2023 | Ekstraklasa | 34 | 2171 | 6 | 6 | 0.5 | 6.93 |
| 2023 | Major League Soccer (United States) | 9 | 358 | 0 | 1 | 0.25 | 6.87 |
| 2023/2024 | Ekstraklasa | 1 | 21 | 0 | 0 | — | 6.43 |
| 2024 | Major League Soccer (United States) | 35 | 2316 | 4 | 1 | 0.19 | 7.07 |
| 2025 | Major League Soccer (United States) | 29 | 1515 | 1 | 1 | 0.12 | 6.69 |
| 2025/2026 | Ekstraklasa | 9 | 373 | 0 | 0 | 0 | 6.54 |
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 2026-08-06
Player stats against each opponent club
| Team | MP | W | D | L | G | A | ||
|---|---|---|---|---|---|---|---|---|
 Seattle Sounders | 5 | 0 | 3 | 2 | 0 | 0 | 0 | 0 |
 Austin | 5 | 2 | 1 | 2 | 0 | 0 | 1 | 0 |
 Vancouver Whitecaps | 4 | 1 | 2 | 1 | 0 | 0 | 2 | 0 |
 Portland Timbers | 4 | 2 | 1 | 1 | 1 | 0 | 1 | 0 |
 Real Salt Lake | 4 | 1 | 0 | 3 | 1 | 0 | 0 | 0 |
 Los Angeles FC | 4 | 2 | 1 | 1 | 0 | 0 | 1 | 0 |
 St. Louis City | 4 | 2 | 1 | 1 | 0 | 0 | 0 | 0 |
 Lechia Gdańsk | 3 | 3 | 0 | 0 | 0 | 0 | 0 | 0 |
 Colorado Rapids | 3 | 1 | 1 | 1 | 1 | 1 | 0 | 0 |
 SJ Earthquakes | 3 | 1 | 1 | 1 | 0 | 0 | 0 | 0 |
 Sporting KC | 3 | 1 | 1 | 1 | 1 | 0 | 1 | 0 |
 LA Galaxy | 3 | 1 | 2 | 0 | 0 | 0 | 0 | 0 |
 Columbus Crew | 3 | 0 | 2 | 1 | 0 | 0 | 0 | 0 |
 Dallas | 3 | 1 | 1 | 1 | 0 | 0 | 2 | 0 |
 Radomiak Radom | 3 | 2 | 1 | 0 | 0 | 0 | 0 | 0 |
 Minnesota United | 3 | 1 | 1 | 1 | 0 | 0 | 0 | 0 |
 Miedź Legnica | 2 | 1 | 0 | 1 | 0 | 0 | 0 | 0 |
 Legia Warszawa | 2 | 1 | 0 | 1 | 0 | 0 | 0 | 0 |
 Katowice | 2 | 0 | 0 | 2 | 0 | 0 | 0 | 0 |
 Wisła Płock | 2 | 2 | 0 | 0 | 0 | 0 | 0 | 0 |
Player stats against each opponent national team
| Team | MP | W | D | L | G | A | ||
|---|---|---|---|---|---|---|---|---|
 Estonia U21 | 1 | 1 | 0 | 0 | 0 | 0 | 1 | 0 |
 Russia U21 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 |
Neither a goal nor an assist came from Sebastian Kowalczyk's 9 Ekstraklasa appearances in 2025/2026 (373 minutes). GioScore's computed rating for the season averages 6.54.
His best-rated season remains 2021/2022 (7.16, Ekstraklasa); his lowest was 2025/2026 (6.54). His two latest rated seasons run 0.39 lower than the rest of his career.
