Napoli man, Dries Mertens admits Napoli have had a bad run of games and must improve their stock, after losing 2-1 to Feyenoord and crashing out of the UCL.
Napoli finished third on the table, behind first placed Manchester City and Shakthar Donetsk and they also lost to Juventus.
Maurizio Sarri’s men will have to drop to the Europa League and must also improve on their domestic performance, Mertens has charged his teammates.
“We are in a difficult period and we didn’t manage to play our usual football,” he told UEFA’s official website.
“During every season you have to face a spell like this, but we want to return to our usual standard as quickly as possible.
“It was not easy tonight after hearing the score from the other game, but we have to look at ourselves in the mirror and try to understand how to start playing our best football again.
“We are a solid group and I’m sure we will do it.”