There, he initially played regularly in the second team, with whom he was promoted to the Regionalliga Nord, then the third tier of the German football league system, in the 2005–06 season.

Under Mönchengladbach head coach Jupp Heynckes, Levels participated in training with the professionals for the first time prior to the 2006–07 season.

Two match days later, he made his first appearance in the starting eleven against VfL Wolfsburg (3:1) and played the entire 90 minutes.

He appeared as a starter in both relegation playoff legs against Hertha BSC, in which Fortuna won 4–3 on aggregate und secured promotion to the Bundesliga.

[7][2] After Stefan Leitl succeeded Walpurgis as coach at the end of August 2017, Levels once again became an integral part of the Ingolstadt squad.