Rasmus Thellufsen

AaB

Thellufsen was promoted to the senior team of AaB along with U19 teammates Magnus Christensen, Morten Rokkedal, Sebastian Grønning, Joakim Mæhle and Bardhec Bytyqi during the 2016–17 pre-season. Sports Director of AaB, Allan Gaarde, described Rasmus as a classic creative midfielder with forces in dribbling and creating the unexpected. The 28 of August, Thellufsen debuted in the Danish Superliga as a substitute for an injured Kasper Risgård in the 34th minute against AGF. A week later, at 7 September, he would get his first starting position in the Danish Cup against Nørresundby from the lower divisions. On 29 August 2019, Hansa Rostock signed Thellufsen on loan until the end of 2019–20 season.

Lyngby

Thellufsen left AaB on 6 September 2020, signing with Lyngby Boldklub. He suffered relegation to the Danish 1st Division with the club on 9 May 2021 after a loss to last placed AC Horsens. On 25 July 2021, Thellufsen scored his first goal for Lyngby, securing a 2–1 away win over Nykøbing deep into injury time, after having come on as a substitute for Magnus Westergaard in the 81st minute. Mainly utilised as a defensive midfielder, Thellufsen had an impressive streak at the end of the 2021–22 season as a central midfielder with three goals in the final two matchdays. His performances helped Lyngby win promotion to the Superliga.

Louisville City

On 5 January 2023, Thellufsen was sold to USL Championship club Louisville City. He was released by…

As of match played 12 November 2022

AaB

Danish Cup Runner-up: 2019–20 Lyngby

Danish 1st Division Runner-up (promotion): 2021–22