Köppel scored 83 goals in the West German top-flight.

[1] For the West Germany national team he collected 11 caps.

[7] Köppel managed Urawa Red Diamonds from 1 February 1997 to 31 December 1997.

Köppel officially took over as manager of Borussia Dortmund II on 1 July 2001.

[8] Köppel was manager until 30 June 2004 when he decided to join Borussia Mönchengladbach's reserve side.