Culio made his CFR Cluj debut on 1 August 2007, in the opening game of the season, starting the match before coming off as a substitute in the 72nd minutes, in a 1–0 win over Oțelul Galați. Since joining the club, he quickly established himself in the first team, playing in the midfield position and was regularly capped player due to his activity on the field and physical endurance. It wasn't until on 7 November 2007 when he scored his first goal for the club but was sent–off for a second bookable offence, in a 2–0 win over FC Vaslui. His performance soon earned him praised from Manager Cristiano Bergodi, as well as, earning Romanian's Player of the Month. Culio later helped CFR Cluj win both the league and Cupa României. At the end of the 2007–08 season, making thirty–seven appearances and scoring once in all competitions, Culio earned recognition by his home country.