Stabæk On 26 November 2015, Hanche-Olsen signed his first professional contract with
Stabæk. He was named captain ahead of the
2018 season after former captain
Morten Morisbak Skjønsberg retired.
Gent On 5 October 2020, Olsen signed for a
Gent for €800k fee. On 17 October 2020, Olsen made his league debut and scored a goal against
Cercle Brugge. On 22 October 2020, Olsen made his debut on
UEFA Europa League.
Mainz On 13 January 2023, Olsen signed a four-and-a-half-year contract with
Bundesliga club
Mainz 05 for €2.5 million fee. ==Career statistics==