Career
Born in Herten in the Ruhr region, he began playing club football with Football Club Schalke 04 in 1999. After several years with the club, he continued his training with Borussia Dortmund and SG Wattenscheid 09. Borussia Dortmund: 2012-2013
After spending a year in their youth setup, Demirbay was promoted to Borussia Dortmund II playing in third tier 3.
Liga.
On 21 July 2012, the first matchday of the 2012-2013 season, he came to his debut in professional football in an away game against VfL Osnabrück, replacing Konstantin Fring from the bench. He scored in the 1–2 home defeat against 1. Football Club Saarbrücken. Hamburger SV: 2013–present
In the 2013-2014 winter break, he agreed to join Hamburger SV on a free transfer in July 2014.
After injury issues and several caps for their second team in fourth tier Regionalliga, he made his Bundesliga debut in the 1–3 home defeat by VfL Wolfsburg on 19 April 2014.
1. Football Club Kaiserslautern
Although performing well in 2014-2015 pre-season games, he moved to 2. Bundesliga side 1. Football Club Kaiserslautern on a season long loan to in August 2014.
There he became a first team regular, starting in 18 matches and being put in another four times. Fortuna Dusseldorf
Returning to Hamburg, he again played pre-season, before signing on a season long loan to Fortuna Dusseldorf on 25 August 2015.
Sexist On-Field Comments
Following being sent off by Steinhaus, he made the comment "women have no place in men"s football".
As a sanction for his behaviour, he was made to referee a junior league girls" football match. Although not having a Turkish passport, Demirbay played international youth football for the Turkish Football Association. In March 2015, he was chosen by Germany U21 coach Horst Hrubesch, but was excluded from games due to injury.
He was then selected for 2015 European Under-21 Championship in the Czechoslovakian Republic, but did not play in any of the games.