Thelissen made his debut for Den Bosch in the 2017–18 season, on 26 October 2017 against Aris Leeuwarden.[2]
After the 2019–20 season, Thelissen decided to move back to Heroes Den Bosch U22.[3]
College career
Initially committed to Utah, he switched his commitment to Utah State and therefore will have three years of college eligibility remaining because he played professionally.[4][5]