Ahead of the 2015 16 season, newly-appointed manager Michael Frontzeck expected Zieler to be the new captain following the departure of Lars Stindl.
Bieber made his debut for Karlsruher SC on 5 February 2010, in a 2 1 away defeat against St . Pauli, after he came off the bench to replace Lars Stindl on the 82 minute.
In 2008, he moved to Karlsruher SC . He made his debut for Karlsruhe on 6 December 2009, in a 3 1 away victory against Rot Weiss Ahlen, after coming off the bench to replace Lars Stindl in the 90th minute.