Walter Mazzarri
In 2006, at age 15, Insigne was signed by Napoli from Olimpia Sant'Arpino for €1,500. In 2008, he made his debut for the "Primavera" team, with whom he scored 15 goals in the 2009–10 season. He was first called-up to the first team under Roberto Donadoni, playing some friendlies in the summer of 2009, before making his Serie A debut under Walter Mazzarri, on 24 January 2010, in a 2–0 win away to Livorno. He played the remainder of the season on loan at Cavese in Lega Pro Prima Divisione, where he made 10 appearances.