[4] On 6 August 2019, Berger made his senior debut in the first round of the Danish Cup in a 2–1 away win after extra-time over Jammerbugt.
[5] He made his league debut in the Danish 1st Division – the second tier of Danish football – a few days later on 11 August in a 0–0 draw against HB Køge, coming on as a substitute in the 80th minute for Mikkel Agger.
[9] He made his European debut on 21 July 2022, coming on as a late substitute in the UEFA Europa Conference League qualifier against Sūduva and slotting home to 1–0 winner shortly after.
[10] On August 4, 2023, Viborg confirmed that Berger - in pursuit of more playing time - moved to FC Fredericia on a season-long loan deal.
[12] On February 1, 2025, Danish Superliga side Silkeborg IF confirmed that they had signed Berger on a deal until the end of 2028.