Napoli coach Maurizio Sarri admitted concern after their 3-0 win over Crotone.

Lorenzo Insigne bagged a brace, with Dries Mertens converting a penalty.

“This was a difficult game for us after an incredible tour de force of fixtures in three tournaments," Sarri told Mediaset Premium.

“Reaching your fourth game in 10 days against a team that is in the relegation zone could be a danger for concentration levels, but instead my side showed maturity with a good performace.

“Our objective is to give our all in every game. We're doing well in Serie A this season and are only one point worse off than at this time last year. Considering then we had Gonzalo Higuain, this time lost Arek Milik to injury and had more Champions League games, I think it's a good return."