He is currently free agent and he is a long-standing member of the Serbia men's national water polo team.

Nikić competed with his national team on the Greek island of Chios in the Samaridis Cup which was more a like preparation tournament for the upcoming 2012 European Championship held in Eindhoven.

On 19 January, in a third game of the tournament, Nikić scored his second goal in a difficult 15–12 victory against the defending European champions Croatia.

On 21 January in the fourth match, Nikić scored his third goal of the tournament for his national team in a routine victory against Romania 14–5.

On 29 January, Nikić won the European Championship with his national team beating in the final Montenegro by 9–8.