*Club domestic league appearances and goals, correct as of 18:25, 17 November 2024 (UTC) ‡ National team caps and goals, correct as of 18:25, 17 November 2024 (UTC)
Bejger joined Lech Poznań from hometown team KS Piłkarz - a club set up in part by his father - in 2015.[4][5] On 31 July 2018, the centre-back completed a transfer to Premier League side Manchester United.[4] He made six total appearances for the U18s across the 2018–19 season, as well as featuring once in the UEFA Youth League for the U19s; in a 2–1 away win against Valencia on 12 December.[2][3] Bejger spent the next season with the U18s, appearing twelve times, before moving up with the U23s in 2020–21.[3] Five appearances followed, while he also featured in the EFL Trophy for the U21s; in a 4–0 away loss to Morecambe on 18 November 2020.[3] He had signed a professional contract when he turned seventeen.[6]
Śląsk Wrocław
On 23 January 2021, Bejger departed Manchester United in order to return to his homeland with Śląsk Wrocław; stating the intention "to obtain experience of senior football", as he penned a four-and-a-half-year contract.[7][8] He made his senior debut in a Ekstraklasa home match with Pogoń Szczecin on 28 February, featuring for the full duration of a 2–1 victory.[3]
Bejger is primarily a centre-back, though is capable of playing at right-back; having played there whilst with Manchester United's academy as well as with the Poland U19s.[6][10]