Sergio Kalaj is a 27-year-old professional football player from ALB. He currently plays for Frosinone, wearing the number 23 shirt. At the international level, he represents Albania U19. He plays primarily as a Defender. He stands at 193cm tall and weighs 79kg. His preferred foot is Right. His current market value is estimated at 150K €.

His most recent move was a Free from Carrarese to Frosinone on 2022-01-13. The reported fee was 0.2M €.

Throughout the Italian Serie B 2024-2025, Sergio Kalaj featured in 8 matches, averaging 0.1 tackles, 0.9 interceptions, and 3.1 clearances per game, while blocking 0 shots per game.