Career
FK Like many other promising youngsters at the club,Ostojić spent time at FK Teleoptik, making his debut in Serbia"s second-tier league on 22 August 2009 against FK Novi Pazar. He went on to play 38 games for the club, scoring 3 goals in the process. On 24 January 2012, along with Miloš Jojić, Ostojić signed his first professional contract with, on a four-year deal.
He made his debut for against FK Javor Ivanjica on 14 April 2012.