Jonas Thorsen

AGF

In 2008, he was on trial with Austrian powerhouse Red Bull Salzburg, where the later head-coach of Viborg FF, Lars Søndergaard, was leading the club's talents. Thorsen signed with Viborg FF in August 2009 after spending a season partly with AGF reserves, and since January 2009 on a professional contract.

Viborg FF

At the age of 19, Thorsen signed with Viborg FF on 31 August 2009. He left the club after eight years in the summer 2017.

AC Horsens

On 21 June 2017, Thorsen signed for AC Horsens on a free transfer. In July 2019, he returned to AC Horsens after one year in Germany with Eintracht Braunschweig. In late 2020, Thorsen underwent surgery for testicular cancer and was subsequently declared healthy. However, the cancer returned in July 2021, after which he started chemotherapy again. For this reason, Thorsen did not play much in the 2021–22 season, just as he left the club after the season when his contract expired.

Return to Viborg

On 12 July 2022, after training with the team for a couple of days, it was confirmed, that Thorsen had signed a one-year deal with his former club Viborg FF.

SønderjyskE

On transfer deadline day, 31 January 2023, Thorsen joined Danish 1st Division club SønderjyskE on a deal for the rest of the season. On 1 May 2024 Thorsen confirmed that he would not extend his contract at the club and would therefore leave SønderjyskE after the season.

Aarhus Fremad

On 13 September 2024 it was…