 It wasn't until 18 February 2019 that he made his league debut for Başakşehir, playing the entire match in a 1–0 win over Antalyaspor, for which he earned the praise of the Turkish media.However, during a 2–1 win over Fenerbahçe on 9 March 2019, Tasci was substituted after a tackle from Joseph Attamah.Because of his Turkish descent and German birth, he was eligible to play internationally for either Germany or Turkey, but in October 2006 he decided to play for Germany despite interest from Turkey.