Walter Mazzarri's Napoli side will have to be wary of Giuseppe Rossi when they face Villarreal in the next round of the Europa League.
Napoli were dealt a tough draw after finishing second in their group.
The Partenopei needed a victory against Steaua Bucharest on Wednesday night and only managed to get it in the 92nd minute when Edinson Cavani popped up with a winner.
Villarreal made light work of their group, winning four of their six matches, but they did lose twice, notably to Dinamo Zagreb and PAOK.
The Yellow Submarine also played on Italian soil in this competition last year, beating Lazio 4-1 at El Madrigal after suffering a 2-1 defeat at the Olimpico.