 He returned to Karlsruhe on loan in the 2008–09 winter transfer window on loan.After Karlsruhe were relegated at the end of the 2008–09 season, Federico originally returned to Borussia Dortmund, but was signed by Arminia Bielefeld on 10 July.After one year with Arminia Bielefeld, he announced his return to VfL Bochum and signed on 10 June 2010.