| Personal information | |||
|---|---|---|---|
| Date of birth | 30 April 1998 | ||
| Place of birth | Mława, Poland | ||
| Height | 1.75 m (5 ft 9 in) | ||
| Position | Midfielder | ||
| Team information | |||
Current team | GKS Katowice | ||
| Number | 22 | ||
| Youth career | |||
| –2012 | Mławianka Mława | ||
| 2012–2014 | Legionovia Legionowo | ||
| Senior career* | |||
| Years | Team | Apps | (Gls) |
| 2014–2016 | Legionovia Legionowo | 42 | (0) |
| 2016–2019 | Zagłębie Sosnowiec | 60 | (1) |
| 2019–2021 | Piast Gliwice | 51 | (4) |
| 2021–2024 | Arka Gdynia | 84 | (3) |
| 2024– | GKS Katowice | 42 | (2) |
| International career | |||
| 2016–2017 | Poland U19 | 8 | (0) |
| 2017–2019 | Poland U20 | 6 | (0) |
| 2019 | Poland U21 | 1 | (0) |
| * Club domestic league appearances and goals as of 10:13, 30 May 2026 (UTC) | |||
Sebastian Milewski (born 30 April 1998) is a Polish professional footballer who plays as a midfielder for Ekstraklasa club GKS Katowice.
Born in Mława, Milewski began playing football with his hometown club, Mławianka Mława. In 2012, he joined the youth system of Legionovia Legionowo.
Milewski made his senior debut in the II liga on 20 May 2015, less than a month after his seventeenth birthday. He subsequently established himself in Legionovia's senior team and made 42 league appearances for the club.
On 26 January 2017, Milewski signed a three-and-a-half-year contract with Zagłębie Sosnowiec. He became a regular member of the team during the 2017–18 season, in which Zagłębie finished second in the I liga and earned promotion to the Ekstraklasa.
Milewski made his Ekstraklasa debut during the following campaign. Zagłębie were relegated at the end of the 2018–19 season, after which he left the club. He recorded 60 league appearances and one goal during his time in Sosnowiec.
On 5 June 2019, Milewski joined reigning Polish champions Piast Gliwice, signing a two-year contract.
His first competitive appearance for Piast came on 13 July 2019, when he started in a 3–1 defeat to Lechia Gdańsk in the 2019 Polish Super Cup. After the departure of Patryk Dziczek, Milewski gained a regular place in Piast's midfield during the 2019–20 season.
He also appeared for Piast in European qualifying competition. Across two league seasons with the Gliwice club, he made 51 Ekstraklasa appearances and scored four goals.
Milewski joined Arka Gdynia in July 2021. An injury delayed his competitive debut until late September, but he later established himself as a regular member of the first team.
During the 2022–23 season, he recorded two goals and six assists. In total, Milewski played 89 competitive matches for Arka, including 84 league appearances, and scored three goals. He left the club when his contract expired on 30 June 2024.
On 4 July 2024, Milewski joined newly promoted Ekstraklasa club GKS Katowice on a free transfer. He signed an initial one-year contract which included an option for a further season.
Milewski made 18 league appearances and scored one goal during the 2024–25 season. On 5 June 2025, GKS exercised the extension option in his contract, retaining him for the following campaign.
In the 2025–26 Ekstraklasa season, he appeared in 24 league matches and scored once as GKS finished fifth, securing qualification for European competition.
On 15 May 2026, Milewski signed a new three-year contract with GKS, extending his stay until 30 June 2029.
In July 2026, he appeared in both legs of GKS Katowice's UEFA Conference League second qualifying round tie against MŠK Žilina. GKS advanced after winning the tie 4–3 on aggregate.
Milewski represented Poland at the under-19, under-20 and under-21 level. In August 2019, he was called up to the Poland under-21s for the 2021 UEFA Euro Under-21 qualifiers against Latvia and Estonia. He made one appearance for the under-21 side, finishing his youth international career with 15 appearances across the three age groups.
| Club | Season | League | Polish Cup | Europe | Other | Total | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Division | Apps | Goals | Apps | Goals | Apps | Goals | Apps | Goals | Apps | Goals | ||
| Legionovia Legionowo | 2014–15 | II liga | 4 | 0 | 0 | 0 | — | — | 4 | 0 | ||
| 2015–16 | II liga | 23 | 0 | 2 | 0 | — | — | 25 | 0 | |||
| 2016–17 | II liga | 15 | 0 | 1 | 0 | — | — | 16 | 0 | |||
| Total | 42 | 0 | 3 | 0 | — | — | 45 | 0 | ||||
| Zagłębie Sosnowiec | 2016–17 | I liga | 12 | 0 | — | — | — | 12 | 0 | |||
| 2017–18 | I liga | 25 | 1 | 1 | 0 | — | — | 26 | 1 | |||
| 2018–19 | Ekstraklasa | 23 | 0 | 1 | 0 | — | — | 24 | 0 | |||
| Total | 60 | 1 | 2 | 0 | — | — | 62 | 1 | ||||
| Piast Gliwice | 2019–20 | Ekstraklasa | 33 | 2 | 2 | 0 | 0 | 0 | 1 | 0 | 36 | 2 |
| 2020–21 | Ekstraklasa | 18 | 2 | 1 | 0 | 2 | 0 | — | 21 | 2 | ||
| Total | 51 | 4 | 3 | 0 | 2 | 0 | 1 | 0 | 57 | 4 | ||
| Arka Gdynia | 2021–22 | I liga | 22 | 0 | 2 | 0 | — | 1 | 0 | 25 | 0 | |
| 2022–23 | I liga | 31 | 2 | 1 | 0 | — | — | 32 | 2 | |||
| 2023–24 | I liga | 29 | 1 | 2 | 0 | — | 1 | 0 | 32 | 1 | ||
| Total | 82 | 3 | 5 | 0 | — | 2 | 0 | 89 | 3 | |||
| GKS Katowice | 2024–25 | Ekstraklasa | 18 | 1 | 2 | 0 | — | — | 20 | 1 | ||
| 2025–26 | Ekstraklasa | 24 | 1 | 3 | 0 | — | — | 27 | 1 | |||
| 2026–27 | Ekstraklasa | 0 | 0 | 0 | 0 | 2 | 0 | — | 2 | 0 | ||
| Total | 42 | 2 | 5 | 0 | 2 | 0 | — | 49 | 2 | |||
| Career total | 277 | 10 | 18 | 0 | 4 | 0 | 3 | 0 | 302 | 10 | ||