Former Ghana international Otto Addo has been placed jointly in charge of Hamburg on an interim basis after the club sacked coach Thorsten Fink.
Addo, the German Bundesliga club's under-19 coach, will work alongside reserve team coach Rodolfo Cardoso.
Germany-born former midfielder Otto played for Hamburg between 2007 and 2008, making 14 appearances.
He represented Ghana between 1999 and 2006, and scored two goals in 15 matches for the the Black Stars.
The club added: "We were no longer confident that Thorsten Fink would be able to turn things around."