 Nyorera kupfuurira kweiyi ndima - Leekens akaita kutanga kwake semutambi wenhabvu muna 1967 na mushure mekusiya nzvimbo dzepasi dzekirabhu. Muna 1969, akasaina kwegore rimwe chete neKFC Dessel Sport. Pashure penguva pfupi paCrossing Club, akaendeswa kuClub Brugge. Neboka racho, akasvika kumagumo eUEFA Champions League muna 1978vachirwa neLiverpool muWembley Stadium muLondon uko vakakundwa nechinangwa chimwe chete. Akakundawo makwikwi mashanu eBelgian, Belgian Cup uye Belgian Super Cup muna 1980, gore rimwe asati ajoina Sint-Niklase kwaakasiya nhabvu muna 1984. 