 Beister made his Fortuna Düsseldorf debut, where he started and played for 65 minutes, in a 1–0 loss against TuS Koblenz in the first round of the DFB–Pokal.It was not until on 11 September 2010 when he made his league debut for the club, in a 1–0 loss against FSV Frankfurt.His first goal for the club did not come until on 18 December 2010 against Greuther Fürth in a 1–0 win.