After finally establishing himself as a starter following the move of coach Fabio Capello to Juventus, Dellas's play was outstanding. He earned the peculiar honour of being one of only three players (including playmaker Francesco Totti and striker Vincenzo Montella) who were not consistently booed by the fans during training and games during Roma's disastrous 2004–05 season. After failing to renew his contract with the club, Dellas became a free agent. He would eventually miss nearly 8 months of football due to back and hernia injuries and thus, expected offers from the big clubs of Europe failed to materialize.