 In total, Rüssmann won 20 caps, scoring one goal (winning goal versus the Soviet Union).In 1987, Rüssmann returned to FC Schalke 04 as an off-pitch authority and was general-manager of the club from 25 February to 10 August 1987.With Borussia Mönchengladbach's veteran general-manager Helmut Grashoff looking for a successor, Rüssmann started to work as assistant to Grashoff at Mönchengladbach in April 1990 and got Grashoff's replacement later on.