Custovic was first to score. El Ghanassy made it 2 - 0, while Pieroni made the third goal thanks to a penalty. Further goals came from Ljubijankic and Azofeifa.
AA Gent are second in their group behind Anderlecht that now have an unassailable lead and are this year's Belgian soccer champions.
Earlier in the day Anderlecht beat Club Brugge 2 - 1. Club are third.
In Group B of the Play Off II section Standard de Liège drew 1 - 1 against Racing Genk. Defour missed a penalty in injury time. Genk win the competition in this group. This means that Genk may still secure a place in Europe next year.
Standard are second and are eliminated from the European race.
Elsewhere Germinal Beerschot drew 2 - 2 against Charleroi that picked up their first point (photo).