|Date of birth||28 January 1954|
|Place of birth||Malatya, Turkey|
|1982–1983||San Jose Earthquakes||1||(0)|
|* Senior club appearances and goals counted for the domestic league only|
A graduate of Ankara University in Political Science. Sezgin started his football career with Petrol Ofisi S.K. in the TFF First League. He later played for Ankaragücü and Adana Demirspor in Turkish Super League, before ending his career with San Jose Earthquakes in USA.
After retiring from football, he founded Professional Footballers Association in Turkey and is the honorary president. He served in Turkish Football Federation as Secretary-General between 1990–1992. He was the president of İstanbulspor until 2004. He is fluent in English. He is married and has three children.
Sezgin served Galatasaray S.K. between 1992 – 93 and 1996–97 within Football Committee. Then in 2005, after Özhan Canaydın elected as Galatasaray president for one more term, Sezgin became the general manager of Galatasaray Sportif, the specialized marketing management company, to oversee marketing operations of the Galatasaray brand.
- "Adnan Sezgin Super Lig stats" (in Turkish). mackolik.com. Archived from the original on 26 September 2018.
- "North American Soccer League Players – Adnan Sezgin". Dave Morrison. Retrieved 15 April 2009.
- "Galatasaray İdari ve Teknik Kadro" (in Turkish). Galatasaray.org.