Dries Mertens acknowledged that Napoli are going through a bad patch after they were knocked out of the Champions League following a 2-1 defeat to Feyenoord on Wednesday.
The result left Maurizio Sarri’s men in third place in Group F, behind winners Manchester City and runners-up Shakhtar Donetsk, who both progress to the knockout stages.
“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.”