 From 1980 until the end of his career in December 1997 he conducted about 250 Swiss and some 75 international games.Amongst these he describes as one of his personal highlights the 1998 FIFA World Cup qualification match on 11 November 1997 between Italy and Russia (1–0) in front of 80 000 spectators at the Stadio San Paolo, Naples.As part of the then practiced German-Swiss referee exchange 1988–1990, Muhmenthaler led four games in the Bundesliga.