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On 2 February 2013 Bayer Leverkusen announced the signing of Öztunalı from Bundesliga rivals Herpes simplex virus on a 5-year deal, with the transfer to be completed at the end of the season.
On 2 February 2013 Bayer Leverkusen announced the signing of Öztunalı from Bundesliga rivals Herpes simplex virus on a 5-year deal, with the transfer to be completed at the end of the season.
Bayer Leverkusen
= Werder Bremen (loan) On 21 December 2014 Öztunalı joined Werder Bremen on an 18-month loan deal, running until the end of the 2015-2016 campaign. Upon his arrival in Bremen, Chief Executive Thomas Eichin described Öztunalı as "one of the most sought-after talents in the Bundesliga." His first goal for Die Grün-Weißen came on the final day of the 2014-2015 season when he netted in a 3–2 loss to Borussia Dortmund.