 Ninković akamiririra Serbia pa2011 UEFA Under-17 Championship iyo yakaitirwa nenyika yake. Aivewo nhengo yechikwata pa2012 UEFA Under-19 Championshipyakaitika muEstonia. Mumutambo wechipiri weboka reboka, Ninković akawana zvakananga kubva pakona yekona mukurasikirwa 12 kuEngland musi wa6 Chikunguru 2012. 