Vasović transferred to Ajax after he had lost 2–1 to Real Madrid with Partizan in the 1966 European Cup Final (scoring the only goal for his team). He did the same (4–1 loss to A.C. Milan, scoring from the spot) in the 1969 European Cup Final, before leading Ajax as captain to a 2–0 victory over Panathinaikos in the 1971 European Cup Final.