OFKベオグラード
Janković initially played in Partizan's youth system, but ultimately joined OFK Beograd along with former Partizan teammates Dejan Dražić, Milan Savić, Nemanja Belaković, and Nikola Aksentijević. On 25 May 2014, he made his professional debut with OFK Beograd under coach Zlatko Krmpotić in a 4–2 loss against Red Star Belgrade. On 11 January 2019, Janković returned to OFK Beograd after two years.