 Kọ itẹsiwaju fun paragirafi yii - Nikolić ṣe akọkọ rẹ fun orilẹ-ede FR Yugoslavia ni 1999 World Championship, ti o gba ami ẹyẹ idẹ. O tun kopa ninu ere Olimpiiki Igba Irẹdanu Ewe 2000 ati awọn aṣaju-ija Yuroopu meji 2004 : àti 2006. Ṣaaju ki o to, Nikolić gba ami ẹyẹ goolu ni 1998 World University Championship. 