 In 2004, he moved to Pescara, being initially assigned to the "Primavera" team.Diakité made his first-team debut on 28 May 2006, in a 0–0 away draw against Mantova for the Serie B championship.Despite only playing one match for the first team, the 19-year-old Pescara youth product was recognized by giants Lazio, who signed him at the end of the 2005–06 season in co-ownership deal for €250,000.