In 2008, Şahan played his first professional match against Alemannia Aachen with MSV Duisburg shirt. For the following seasons he started to play more frequently. In the 2010–11 season, from the beginning he became the number one choice for his coach Milan Šašić. After a successful season he was transferred to 1. FC Kaiserslautern. With his new team he started to play at Bundesliga level and inspired Fritz-Walter-Stadion guests very quickly in a short time.
Beşiktaş
Before the 2012–13 season he was transferred to Turkish side Beşiktaş, for an €800,000 fee on a four-year contract. From the beginning of the season, coach Samet Aybaba placed him on the first eleven in every game of the season. On 22 October 2012, Şahan scored his first league goal against Gaziantepspor. He finished the season with 11 goals and eight assists. With his successful first season at the club, he became one of the favorite players in the eyes of Beşiktaş fans.
Şahan plays as an attacking midfielder, generally as a left winger in Turkish Super League. At the international level he was used as a "playmaker" by Fatih Terim. He is known for his quickness, pace and hardworking forms.
Career statistics
Club
Appearances and goals by club, season and competition