Napoli boss Rafa Benitez believes that his team will continue to get better on the back of beating Borussia Dortmund 2-1 on Wednesday.
The Partenopei went ahead through a Gonzalo Higuain header and eased into control following Roman Weidenfeller's sending-off, with Lorenzo Insigne firing in a rocket of a free kick in the second half to double the lead.
Although Juan Zuniga scored a late own goal to narrow the gap, the hosts held on and Benitez left the Stadio San Paolo immensely pleased with his squad's European endeavours.
"I am satisfied, as we did everything we talked about before the game," the 53-year-old told Sky Sport.
"We knew Borussia were very dangerous on the break but we talked about intensity and everyone helping out in defence.
"Last time I said the team was at 72 per cent and I still think we can improve a lot. Against the European runners-up I have to be satisfied and positive, as it's a great result.
"These new players – like Gonzalo Higuain, Jose Maria Callejon and Dries Mertens – are of international quality. It was all about giving the group confidence and players like Marek Hamsik and Lorenzo Insigne are enjoying this style of football. I am sure, in one or two months, it will be even better."