 He was signed by Napoli on 1 September 2008, for €2,675,000, With the departure of Maurizio Domizzi and Erminio Rullo, Aronica was featured as a left-sided central defender or as a left-sided wingback ahead of Mirko Savini in the team's 3–5–2 formation, sharing the role of the team's left wingback with Luigi Vitale.In 2010–11 season he started to play with Paolo Cannavaro and Hugo Campagnaro consistently.Although they played well that season, in the following season the squad's lack of depth made it difficult to face both 2011–12 UEFA Champions League and 2011–12 Serie A, making the club slip from a third-place finish in 2010–11 to fifth place in 2011–12.