On 10 August 2021, Andreasen made his official debut for Hvidovre in the Danish Cup in a match against Herstedøster IC.
Then, in the aforementioned month, he signed his first contract with Hvidovre and was promoted to the first team at the same time.
[3] From the start of the year until the end of the season, Andreasen appeared in 11 games, contributing to Hvidovre's promotion to the 2023-24 Danish Superliga.
On 21 July 2023, Andreasen made his debut in the top Danish league in a match against FC Midtjylland.
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