"Clearly at this moment the result favours our opponents, but the second leg remains open," Pioli told Rai Sport.
"We are satisfied with the performance, but should've made more of the chances we created to score more.
"We will go to the San Paolo to score a goal, which is our attitude in every game anyway, and have a month to prepare.
"When we conceded the goal, we should've been more careful in defence and not let them through. Right at the end if Parolo's pass had been 2cm further forward, Cataldi would've been clear on goal.
"It is a tough fixture, but I believe we have the quality and characteristics to qualify. Of course we wanted a better result tonight, but we have the potential to score in Naples. We believe in our chances and tonight's performance should give our players more belief too.
"In the first half our three forwards did well to interrupt Napoli starting moves from the back. We didn't close them down quite as well after the break and that allowed them to come forward."
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