Sergio Kalaj is an Albanian professional footballer who plays as a central defender for Italian Serie A side Frosinone, standing out for his imposing 193cm frame. Born on January 28, 2000, Kalaj began his career in Albania with Skënderbeu Korçë before moving to Italy to further his development. His performances at the youth and senior levels in Albania caught the attention of scouts, leading to his transfer to Frosinone, where he has worked to establish himself in a competitive league. As a tall and physically strong centre-back, Kalaj is adept in aerial duels and brings a composed presence to the backline. While still building his career stats and highlights at the top level, he is considered a promising talent for the Albanian national team. His style is defined by traditional defensive strengths, and his current market value reflects his potential as a developing defender in European football.