In November 2011 he joined OKK Spars, and previously played for Zlatorog Laško and Postojna.

[1] After rumors in early June, Nikolic had signed officially on July 7, 2015, with German champions Brose Bamberg for four years.

He also plays their for farm team Bike-Café Messingschlager Baunach in the second-tier ProA league.

[13] As a member of the senior men's Slovenian national basketball team, Nikolić competed at the FIBA World Cup 2014.

His father was a basketball player, played for Postojna, and was an assistant coach of Slovenian senior national team from 2004 to 2006.