The Partenopei, who are making just their second appearance in Europe's premier club competition since it was rebranded in 1992, looked overwhelmed during the early stages of the game at the Emirates Stadium, conceding twice in the opening 15 minutes through Mesut Ozil and Olivier Giroud.
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"We paid dearly for our start, suffering too much and we were punished. You pay for certain lapses [in concentration].
"However, I liked the character shown in the second half, even if at that point the game was already in Arsenal's hands.
"The road is long and we will continue to work hard. We need to start over again in the league."
Napoli, who currently sit second in Serie A, return to domestic action on Sunday with a game against Livorno at the San Paolo.