 Paci started his career at Ancona.He made his Serie A debut for Lecce on 18 September 2004 against Brescia.In July 2005, he was signed by Genoa, but after Genoa Serie A place was canceled due to match-fixing, he was loaned to Ascoli which replace Genoa in Serie A.

Paci moved to Parma in 2006 for €1.8 million in a 4-year contract.