 He started playing football when he was six; he then played for the youth teams of SC Altbach, Stuttgarter Kickers and VfB Stuttgart.Before the 2005–06 season, he joined Stuttgart's second team, playing in the Regionalliga (third division), helping them win the German B-Junior Championship and German A-Junior Championship.Ahead of the 2006–07 season, Tasci was promoted to the club's Bundesliga side.