Sardo officially transferred to newly promoted Catania in August 2006, and made 12 starts in 17 league appearances in his first season with the club, under then-coach Pasquale Marino.

For the 2008–09 season, Sardo remained as one of the regular starters under Walter Zenga, and made 12 starts in 14 league appearances.

But following the purchase of right back Alessandro Potenza from Genoa, Sardo was sent on loan to Chievo on 31 January 2009[2] along with teammate Giuseppe Colucci, who found playing time very limited in Sicily.

However, on the final day of the transfer market (31 August), Catania announced that Sardo would move back to Chievo again on loan.

Following the move, Sardo broke into Domenico Di Carlo's starting line-up and was one of the stand-out performers in Chievo's season, notably scoring against Juventus where he scored a scorcher in the 33rd minute to put Chievo ahead in the Serie A clash, while he also poured a load of trouble versus his owners, Catania, in a 1–1 draw.

[citation needed] Sardo went on to make 22 league appearances for the Verona based club, scoring 3 goals and shared the right-back role with Nicolas Frey but sometimes featured at right wing-back role when Frey was used as one of the 3 central defender in 4–3–3 formation and even replaced midfielder Michele Marcolini in 2–0 won Fiorentina on 25 April in 3–5–2 formation.