The Italians are currently second in Group F after their 3-2 win over Marseille, but Maggio knows that there are still two very hard games to come.
"We all knew this would be a difficult game, a trap for us to some extent," he told ESPN. "Even when we found ourselves behind we reacted well.
"The Champions League is never easy. There are so many strong sides who can put you in trouble, but we kept our cool and ended up winning an important game.
"A draw is enough now but we know it won't be easy. We will try our best as we are enjoying a great tournament so far."
Napoli are level on points with group leaders Arsenal and three ahead of Borussia Dortmund.