|Full name||Mehmet Seyfettin Sedef|
|Date of birth||5 August 1987|
|Place of birth||Kilis, Turkey|
|Height||1.80 m (5 ft 11 in)|
|Playing position||Centre back / Left back|
|* Senior club appearances and goals counted for the domestic league only and correct as of 13 August 2016.
After passing through their youth ranks, he joined the Beşiktaş senior squad in 2005, making his Süper Lig debut on 28 May 2005 against Akçaabat Sebatspor in the last match of 2004-2005 season. He was loaned to Altay S.K. to the end of 2008-2009 season and Çaykur Rizespor for the 2009–10 season.
Following the away match against Konyaspor played on October 10, 2013, without any prior disturbances or indications, he reported a heart condition as the team was boarding the plane back home. The prompt examinations revealed that he had been suffering a heart attack and was taken into intensive care for the necessary operation and follow-up. He played full 90 minutes in that aforementioned match.
- Mehmet Sedef at the Turkish Football Federation
- "Gaziantepspor, Mehmet Sedef ile yollarını ayırdı" [Gaziantepspor parted ways with Mehmet Sedef] (in Turkish). Gaziantepspor. 31 October 2015.
- Mehmet Sedef at Mackolik
|This biographical article related to a Turkish association football defender is a stub. You can help Wikipedia by expanding it.|