 He was named as part of the first-team squad for the 2007–08 season, but did not make an appearance, continuing to be a regular for the reserves.In July 2008, Celozzi joined Karlsruher SC, and made his first appearance on 10 August 2008 in the first round of the DFB-Pokal, against SpVgg Ansbach.He made his Bundesliga debut on 16 August 2008 in the opening fixture against VfL Bochum.