Attacking midfielder Otto Addo was born in Germany, where he has spent his whole professional career. He started as a trainee with his hometown club Hamburg, before moving on to Hannover, who were then in the second division. His displays earned him a move to Bundesliga giants Borussia Dortmund in 1999 and, although he initially made a positive impression at the Westfalenstadion, his time with the club was ruined by a succession of serious knee injuries. After making just 75 league appearances in six seasons, the versatile Addo left Dortmund in 2005 and signed a two-year contract with Mainz.