*Club domestic league appearances and goals, correct as of 19:55, 10 November 2024 (UTC) ‡ National team caps and goals, correct as of 22:46, 15 November 2024 (UTC)
Kozubal started his career at Beniaminek Krosno. He trialed with Legia Warsaw and English club Manchester United before choosing to join Lech Poznań, a club he "dreamed of playing for", in 2017.[1] He spent several years playing for Lech's youth sides before joining the under-19s roster for the 2020–21 season.[2] Soon after, on 8 August 2020, he made his first appearance for Lech's reserves in a 3–2 Polish Cup win over Elana Toruń.[3]
Lech Poznań
In January 2021, he was promoted to the first team.[4] He made his debut on 14 March 2021, coming onto the pitch in the 84th minute of a goalless league draw against Piast Gliwice.[5] With his sole first team appearance across the 2020–21 season, he became the second youngest player to feature for Lech, at the age of 16 years, six months and 24 days.[6] Three days later, he extended his deal with Lech until 2024.[7]
In the following campaign, he made one league and three cup appearances, while continuing to feature regularly in the II liga for the reserve side.[8]
2022: Loan to Górnik Polkowice
On 13 January 2022, Kozubal was sent on loan until the end of the season to the last-placed I liga club Górnik Polkowice.[9] He made a total of 14 appearances as Górnik finished 17th and was unable to avoid relegation.[10][11]
2023–2024: Loan to GKS Katowice
The start of the 2022–23 season saw Kozubal with limited opportunities in the first team, as he made two substitute appearances against Dinamo Batumi in the UEFA Europa Conference League second qualifying round in July 2022.[12] To find more playing time at a higher level of competition, Kozubal moved on loan to another I liga side GKS Katowice on 23 February 2023.[13] He recorded one goal and one assist in eight games, and had his loan extended for a further year on 3 July.[14]
During the 2023–24 season, Kozubal scored five goals and registered ten assists in 34 appearances.[6] He was the league's top assist provider,[15] as GKS finished the season in 2nd and won promotion, ending their 19-year absence from the top tier.[16]
2024–25: First team breakthrough
After returning to Poznań ahead of the 2024–25 campaign, Kozubal signed a new deal with Lech, keeping him at the club until mid-2028.[17] He immediately established himself as a regular in Lech's line-up,[6] and was voted Ekstraklasa's October Young Player of the Month.[18] On 10 November 2024, he netted his first Ekstraklasa goal in a 5–2 home win over rivals Legia Warsaw.[19]
International career
Having represented several Poland youth teams, Kozubal received his first senior team call-up on 5 November 2024 for the UEFA Nations League matches against Portugal and Scotland.[citation needed] He debuted against the former opponent as a second-half substitute in a 5–1 away loss.[20]