He is on the books of FK Kozara Gradiska and wears shirt number 16. His main role on the pitch is Defender. His stronger foot is Right. His estimated market valuation currently stands at 50K €.

His latest transfer saw him join FK Kozara Gradiska from FK Sarajevo B via on 2026-01-15.

Across the Bosnia and Herzegovina Cup 2025-2026, Sergej Popović appeared in 1 matches and averaged 0 tackles, 0 interceptions, 0 clearances, and 0 blocked shots per game.