 On 5 January 2019, having spent six-months as a free agent, he finally moved to Turkey to join title contender İstanbul Başakşehir.Upon joining the club, Tasci said it was a dream for him to play in Turkey.Tasci made his debut, playing the full 90 minutes in a 1–0 win over Hatayspor in the first leg round of 16 of the Turkish Cup.