sentences:  Since June 2018, Nikolić has been the head coach of First League FBiH club NK Bratstvo Gračanica.His biggest success was when he led FK Modriča to a place in the 2003–04 Premier League of Bosnia and Herzegovina after he won with Modriča the 2002–03 First League of the Republika Srpska.He was also the head coach of the Bosnia-Herzegovina U19 team and the Bosnia-Herzegovina U21 team.