Napoli coach Rafa Benitez says his side could have scored more goals against Slovan Bratislava on Thursday night.
The Partenopei eased past Jozef Chovanec's side by 3-0 as they secured first place in Group I of the competition.
"I'm happy with the scoreline but in certain games you have to score more," Benitez said.
"We started the game well and this is why I say you can do better when you start the game well. We're happy with the 3-0 but I believe we could have scored more.
"Marek [Hamsik] did what he always does in respect to his game and effort. He scored tonight and we're happy but he's always important for our team and for our campaign.
"I speak to Hamsik a lot, we analyse his games, he knows he's the only player with freedom of movement in our team, he can play in the center, shift to the wing, help the defence. I am happy of his effort and I'm sure he'll score more goals.
"We have a good squad but there are other quality teams in the Europa League. I know this competition and I know how tough it is."
A tough away game against Milan awaits Napoli this weekend in the Serie A and Benitez says Filippo Inzaghi's side are "quality".
"The Milan game will be a technical one," added the Spaniard.
"They are quality and we will need the right mental approach to the game."
