Career
Aksentijević started playing football with his hometown club Radnički Kragujevac. He subsequently joined the youth academy of Partizan in 2006. In October 2010, due to absence of numerous national team players, Aksentijević was one of five juniors who were invited to the first team for the rescheduled cup match against Mladost Apatin.
In the 2011 winter transfer window, Aksentijević was loaned to Teleoptik.
He made 10 league appearances until the end of the 2010-2011 season. During this period, Aksentijević, who played as a defensive midfielder during his junior years, was moved to play at the right-back position by Teleoptik manager Vuk Rašović.
On 6 July 2011, Aksentijević signed his first professional contract with Partizan, on a five-year deal. He scored a long-range goal on his league debut against Sloboda Užice on 21 August 2011.
However, Partizan lost the match 2–1.
Aksentijević represented Serbia at Under-17, Under-19 and Under-21 level