Kammala jumla mai zuwa: Žižić ya taka leda tare da 'yan wasan matasa na kasar Croatia. Tare da 'yan wasan matasa na kasar Croatia, ya taka leda a 2013 FIBA Turai Under-16 Championship, da 2014 FIBA Turai Under-18 Championship, inda ya lashe lambar tagulla, kuma a
2015 FIBA Under-19 World Championship, inda ya lashe lambar azurfa.