[10] Vermeulen performed double-duties the following year, driving for Emil Frey Racing in both the GT World Challenge Europe Sprint Cup, where he was paired up with Albert Costa, and the DTM.

[11][12] In the former, the Dutchman struggled to keep pace with race-winning teammate Jack Aitken, though he would become a regular top-ten finisher during the second half of the season, leaving him 16th overall with a best result of fifth at the Sachsenring.

[13] The latter series saw him and Costa take three podiums at the back end of the season, missing another when Vermeulen was penalised for colliding with Dries Vanthoor at the final corner in Hockenheim, which resulted in fourth place in the championship.

[14][15][16] For the 2024 season, Vermeulen returned to contest the DTM with Emil Frey and remained with the team in the GTWC Sprint Cup, this time partnering Giacomo Altoè.

[17][18] At the opening DTM round in Oschersleben, the Dutchman collided with René Rast, resulting in an incensed Vermeulen showing the German the middle finger — he later received a reprimand for causing the collision and a warning for the gesture.