Barcelona coach Ernesto Valverde says they'll not be underestimating Napoli.

The two teams will meet in the Champions League round of 16.

“Napoli are a strong and complicated opponent with a great atmosphere in their stadium. You never know what form the teams will be in," said Valverde.

“They have impressive strikers like Dries Mertens and Lorenzo Insigne. They already proved their quality in our pre-season friendlies and play good football."

Valverde has already experienced the Stadio San Paolo when his Athletic Bilbao played there in 2014.

“It's a passionate arena, where you can really feel the fans. We are accustomed to playing in atmospheres like that, though, and playing in Naples will be a wonderful experience."