Career
This included two golds (C-1 1000 m: 1976, C-2 500 m: 1984 with Mirko Nišović), one silver (C-2 1000 m: 1984 with Mirko Nišović), and one bronze (C-1 500 m: 1976). His trainer was Laszlo Hingl. Ljubek later became vice-president of the Croatian Olympic Committee and served as chef de mission for the Croatian Olympic team