He won many judo championships in Serbia and the Balkan region before he went to compete in kickboxing.
[26] Stošić, as a replacement for Jay Silva, faced Michał Kita on June 5, 2021, at KSW 61.
[28] Stošić faced Michał Andryszak on September 4, 2021, at KSW 63: Crime of The Century.
[30] He lost the bout via TKO after tapping due to combination of exhaustion and damage in the fifth round.
[31] Stošić faced Michał Kita in a rematch at KSW 74: De Fries vs. Prasel on September 10, 2022.
[33] Stošić faced Shamil Gaziev on February 18, 2023, at BRAVE CF 69, losing the bout via TKO stoppage in the first round.
[36] Stošić faced Matheus Scheffel at XTB KSW Epic: Chalidow vs Adamek on February 24, 2024, winning the bout via ground and pound TKO in the first round.
[37] On June 1, 2024, Stošić faced Miran Fabjan in the main event of FNC 17, defeating him via TKO stoppage despite being hurt earlier in the round.