[3] Later, during the spring half-season, coach Ivan Tomić used him as a back-up player in matches against Radnik Surdulica[4] and Vojvodina.
[5] In summer 2016, Birmančević was loaned to Teleoptik,[6] where he scored 4 goals on 22 matches in the Serbian League Belgrade for the 2016–17 season.
[9] In May 2024, Birmančević helped the club to win its second championship title in two seasons[10] and domestic cup.
[15] In August 2016, he was called into the Serbia U19 squad for the memorial tournament "Stevan Vilotić - Ćele".
[17] In January 2021, Birmančević was called up to the Serbian senior squad by coach Ilija Stolica.