 After being included as an unused substitute in a match against 1.FC Nürnberg, Tasci had his professional debut against Arminia Bielefeld on 20 August 2006; the match—the second of the season—was a 3–2 win in which Tasci was substituted for injured Danish striker Jon Dahl Tomasson in the 68th minutes.His first goal followed a week later in a game against Borussia Dortmund in a 1–3 defeat.