Born in Alkmaar, Netherlands, to his Turkish parents, Öztürk grew up with three siblings and started playing football when he was nine years old and joining AFC '34 youth team.

[7] Öztürk made his Hearts debut, playing in the centre-back along with Danny Wilson, in a 2–1 win over Rangers in the opening game of the season.

With 33 appearances and scoring four times in his first season at Hearts, Öztürk was among six players to be named 2014–15 Championship's Team of the Year.

[22] On 21 June 2018, EFL League One club Sunderland announced the signing of Öztürk on a free transfer with a two-year contract.

[23] Ozturk struggled to cement his place in the team and it was announced on 17 June 2020 that he would be leaving Sunderland, bringing to an end his two years at the club.