Insigne initially chose the shirt number 42 at Napoli, as his older brother and Napoli teammate Lorenzo wore the number 24, but later chose the number 30, and finally the number 94, as it represented the year of his birth. After playing for the Napoli Primavera side in the club's youth system, he made his professional debut for the club's senior side under manager Walter Mazzarri in the Europa League on 6 December 2012, in a 2–0 home defeat against PSV Eindhoven; his first appearance in Serie A came on 13 January 2013, as he appeared as a very late substitute in a 3–0 home win against Palermo, playing alongside his older brother.
