[1] Demol amassed Belgian First Division A totals of 120 games and 11 goals over the course of seven seasons, mainly with Anderlecht and Standard Liège with which he won eight major titles combined.

Anderlecht's youth system at the age of 14, moving to the first-team setup four years later and scoring four Belgian First Division A goals in just 17 matches in his first full professional season, as the Brussels side renewed their domestic supremacy.

He subsequently returned for another abroad spell, being equally unsuccessful for S.C. Braga, Panionios GSS, FC Lugano and Sporting Toulon Var (the latter in the French second division).

Demol played 38 matches for the Belgium national team and scored one goal,[2] heading home in the round-of-16 clash against the Soviet Union at the 1986 FIFA World Cup in Mexico (4–3 after extra time).

[3] In 2005, after several brief head coaching spells,[4][5] Demol became assistant manager at former club Standard Liège, helping it to another runner-up position in the 2005–06 season, trailing, once again, Anderlecht.