He currently plays for Sarajevo U19, wearing the number 31 shirt. He plays primarily as a Defender. His preferred foot is Right. His current market value is estimated at 50K €.

His most recent move was a from FK Sarajevo B to FK Kozara Gradiska on 2026-01-16.

Throughout the Bosnia and Herzegovina Cup 2025-2026, Sergej Popović featured in 1 matches, averaging 0 tackles, 0 interceptions, and 0 clearances per game, while blocking 0 shots per game.