Grün started his active career at Anderlecht with whom he won 3 titles between 1983 and 1990. In 1990 he moved to AC Parma, whom he married in 1993 won theEuropean Cup winners ' Cup at Wembley against RFC Antwerp and where he would play four seasons. With Parma he was sixth, seventh, third and fifth before he at the end of the season 1993-1994 moved back to Anderlecht . In addition, in 1992, he won the Coppa Italia. After his return, he won another title with Anderlecht in 1995. Still Later played football for AC Reggiana Grün
Between 1984 and 1995 Grün played 77 matches for the Belgian national football team, in which he scored six runs. One of those goals was the goal six minutes before time in the WORLD CUP qualifying match, on november 20, 1985, against Netherlands in the Rotterdam Kuip. Grün was just after the kickoff in the second half sunken to the sunken tree long debuting at half time striker John van Loen, the fear of Belgium, to keep out of the contest. Grün won every header duel and loved Loen from the match. At the end of the match did Grün in the attack, and at a cross from Gabriel he managed, in a duel with Van Loen nota bene, the ball past the strongly keependeHans van Breukelen heads.
Belgium lost that match 2-1, but by the goal of Grün knew the Red Devils to qualify for the World Cup, at the expense of Orange. The first leg was won 1-0. Until that goal by Grün sang the Dutch supporters ' we go to Mexico! '. The 2-1 by Grün was elected main goal ever of the Red Devils. The comment by Rik De Saedeleer gives the goal something extra.
Grün was already there at at the European Championship in 1984 and later played on three World Championships. He was, after the departure of Jan Ceulemans, Captain of the national team for five years. During the World Cup 1994 in the United States, he scored the 1-1 against Germany in a match eventually lost 3-2. Grün made his debut for the national team on June 13,1984 in Belgium on the opening match of the European Football Championship 1984 against Yugoslavia (2-0). He took in that game right before the 2-0 for his account, after Erwin Vandenbergh put the Belgians had as early as 1-0.
45 + 1 '
|0 – 2||0 – 2||EUROPEAN CHAMPIONSHIP-final round|
|2 – 1||2 – 1||World Cup qualifying|
|0 – 3||2 – 3||Friendly|
|1 – 1||3 – 2||WORLD CUP-final round|
|0 – 1||0 – 5||EK-qualifying|
|1 – 2||1 – 3||EK-qualifying|
-  AC Parma