Napoli midfielder Marek Hamsik admitted there was a gulf between his side and high-flying opponents Arsenal on Tuesday.
A mob stormed into a restaurant injuring at least one person ahead of Tuesday's Arsenal v Napoli match.
Mesut Ozil scored one and made the other as Arsenal outclassed Napoli to claim a 2-0 win in the UEFA Champions League.
Rafa Benitez was left to count the cost of a slow start as Napoli stumbled out of the blocks in a 2-0 defeat to Arsenal.
Napoli striker Gonzalo Higuain has emerged as an injury doubt ahead of Tuesday night's Champions League game at Arsenal.