He headed himself into history on 20 November 1985 when his goal against The Netherlands in Rotterdam made Belgium, and not The Netherlands, go to the World Cup in Mexico. It is one of the most iconic moments in Belgium’s football history.

Grün was a defender with a strong header who had already scored a header one year prior against Yugoslavia at the European Championship in France. His pragmatism and intelligence made him indispensable in the team of Guy Thys. He played in four big tournaments. Apart from the European Championship in 1984, he also played the World Cup in 1986, 1990 and 1994.