With the Umbrians Hilário played in the 1999 UEFA Intertoto Cup, with his team being eliminated by Trabzonspor in the third round. He only appeared regularly in his first full season in Serie A (20 games), helping the side to a final midtable position and sharing teams with the likes of Hidetoshi Nakata, Alessandro Calori, Giovanni Tedesco, Massimiliano Esposito and Milan Rapaić; he never scored a goal for the club, but netted one in his own net against Inter Milan on 6 January 2000.