In total he earned two caps for West Germany. During his club career he played for Hessen Kassel. Already at the age of 17, Metzner took part in an instruction training of the German national team, however World World War II stopped Metzner"s aspirations.
Metzner had to serve in the war where he received a hand injury, which handicapped him throughout the rest of his life.
After the war, Metzner played for Hessen Kassel as an inside forward and as a half back. He was first called up by West German coach Sepp Herberger for a 1952 international friendly against Yugoslavia, where he did not play.
His international debut came a week later in the game against Spain in Madrid. Metzner ended his career on 5 August 1961, in a friendly game between Kassel and Radnički Belgrade.
He played 620 times for Hessen Kassel.
Metzner died of heart failure in 1994.