Marco Landucci, assistant to Massimiliano Allegri, said Napoli must respond through hard work after their defeat by Juventus.
Landucci accepted that the Turin club deserved their victory over Napoli, saying: “We lost to Juventus on merit.”
He believes a sustained effort on the training ground is the best way for Napoli to avoid further problems.
Napoli’s next fixture is against Lazio.