Bućan coached youth men's selections of the Serbia national team (under-18, under-19, under-20). At the 2013 FIBA Europe Under-18 Championship, Serbia finished 6th among 16 teams. At the 2014 FIBA Europe Under-18 Championship Serbia won silver medal. At the 2015 FIBA Under-19 World Championship, Serbia finished 9th among 16 teams. At the 2016 FIBA Europe Under-20 Championship, Serbia finished 11th among 16 teams.