[1] Thys was born in Antwerp and started his career in the 1940s and 50s as a football player with Beerschot, Daring Molenbeek and Standard.

He became a full-time trainer with Wezel the same year, followed by Herentals, Beveren, Union Sint-Gillis, and Antwerp.

Eight months after stepping down as manager Thys was re-appointed in early 1990 in order to take charge of the team for the 1990 World Cup.

The side duly qualified through the group stage and was knocked out by the England national team in the second round of the tournament.

Under his lead the Red Devils participated twice in the European Championship, and three times at the World Cup.