Detlef Müller (footballer)

Metin Mert (born Detlef Müller; 21 May 1965) is a German-born naturalised Turkish professional footballer who played as a goalkeeper.

Career
Detlef Müller was born Duisburg, West Germany. His first Oberliga game for Bochum II was on 31 December 1983 in a 3–0 win against Hammer SpVg. He was substituted on in the 75th minute for Markus Croonen. In summer 1985 Müller transferred to Westfalia Herne, where he played until 1988.

During a vacation to Turkey in 1988 Müller was spotted by Erdal Keser playing Beach soccer. He was offered a contract from Sarıyer out of the Turkish First Football League, which he accepted.

Honours
Kocaelispor
 * Turkish Cup: 2002