He excelled in reading the game and through his athletic stature. Dewalque was moved from attack via midfield to the centre back position at Standard. He often played with risk when playing the ball out, but his excellent technique ensured he rarely got into trouble. Intelligent and, as such, a great organiser. He was a starting player in the defence of national team manager Raymond Goethals and played the 1970 World Cup and the European Championship in 1972.