*Club domestic league appearances and goals, correct as of 22:09, 5 October 2024 (UTC) ‡ National team caps and goals, correct as of 13:15, 24 October 2023 (UTC)
Born in Warsaw and raised in nearby Marki, Kowalczyk began his football journey at the age of six with Ząbkovia Ząbki.[2] Displaying remarkable maturity at a young age, he took his first steps in senior football at the age of 14 with Ząbkovia.[2] His talent quickly attracted the interest of several Polish clubs.[3] Ultimately, in 2021, he chose to sign with ŁKS Łódź. The club's second team competed in the fourth tier, providing Kowalczyk with an opportunity to develop against senior opposition at a higher level.[3] He made his second-team debut on 7 August 2021, starting in a 4–3 victory against Ursus Warsaw.[4]
Kowalczyk made his professional debut for the ŁKS first team on 26 February 2022, coming on as a substitute for Jakub Tosik in the 65th minute during a 1–1 away draw against GKS Jastrzębie in the second-tier I liga.[5] On 8 April 2021, he scored his first professional goal, securing a late winner in the 95th minute of a 3–2 home win over Sandecja Nowy Sącz.[6]
During the 2022–23 season, Kowalczyk played a significant role in ŁKS' promotion to the top-tier Ekstraklasa, scoring six goals in 26 appearances for the Knights of Spring—including a decisive goal that secured the league title on 26 May 2023, against Arka Gdynia.[1][7]
Brøndby
On 2 August 2023, Kowalczyk signed a four-year contract with Danish Superliga club Brøndby, with the club paying a reported fee of €1.2 million to secure his services.[8][9] He made his debut for the club on 27 September, replacing Nicolai Vallys in the 68th minute of a 3–0 victory in the Danish Cup over HIK.[10] Four days later, he made his Superliga debut, again coming on as a late substitute for Vallys in a victory against Hvidovre.[11]
Loan to GKS Katowice
On 17 July 2024, Kowalczyk returned to Poland to join newly promoted Ekstraklasa club GKS Katowice on a season-long loan, with an option to make the move permanent.[12]
Kowalczyk was called up to the senior Poland national team for the first time for the Nations League games against Scotland and Croatia in September 2024.[18]
Style of play
Kowalczyk, a hard-working central midfielder, displayed remarkable maturity on the pitch early on, making his senior football debut at the young age of 14.[3] He describes himself as a player capable of controlling the game's pace, comfortable both in attacking and defensive roles. Despite his average height (1.81 m), he possesses excellent heading abilities.[19] Often referred to as a 'piranha' in midfield, he excels in dispossessing opponents and is adept at playing a Gegenpressing style.[20]