Mladen Devetak is a 27-year-old professional football player from SRB. He currently plays for Rijeka, wearing the number 34 shirt. At the international level, he represents Serbia U21. He plays primarily as a Defender. He stands at 183cm tall and weighs 72kg. His preferred foot is Left. His current market value is estimated at 1000K €.

His most recent move was a Free from Palermo to Rijeka on 2024-08-06.

Throughout the Croatian Football League 2025-2026, Mladen Devetak featured in 23 matches, averaging 1 tackles, 0.6 interceptions, and 1.9 clearances per game, while blocking 0.1 shots per game.