The Swans were more than a match for their Europa League last-32 opponents, and the manager feels the performance can boost their upcoming displays in the Premier League
The Welsh club produced a fine display in the first leg of their last-32 tie on Thursday, enjoying the better of an entertaining 0-0 draw at the Liberty Stadium.
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"We should have had more, but what a performance from us. [Napoli] are one of the top teams in Europe," Monk told reporters.
"I said to the players afterwards, 'wow'. If they can do that against them, then they can do it against anyone. It's a great confidence boost for the players.
"The only disappointment is we didn't get a goal. We deserved at least a couple of goals."
Looking ahead to the return fixture at Stadio San Paolo, Monk added: "We kind of needed a goal, because it gives you that edge going into the second leg.
"But we have nothing to lose when we go there. The pressure is on them.
"The good thing is they have to win. We will go over there and compete with them. It will be a great experience for everyone at the club. To be in with a shout, that's all we can ask for in this competition."