Weak physical constitution in the younger categories made him uncompromising fighter, and this characteristic is now kept as a first team player.
[1] On 21 March 2012, he scored a goal against Red Star's arch rivals Partizan in the Eternal derby.
He joined another Serbia Rodoljub Paunović and South Korean defender Park Tae-soo as a foreign player at the club.
On 5 September 2013, Milunović scored two goals against Cyprus U21 playing for Serbia U21 in the 2015 UEFA European Under-21 Football Championship qualification.
[10] Just a month later on 15 October 2013, he continued his good form in the same tournament scoring a goal against Northern Ireland U21.