The diagnosis of Kostas Manolas' injury is of first degree distraction to the obturator muscle.
The Napoli defender, who came out after a quarter of an hour of the match against Udinese on Sunday due to a pain in his right thigh, underwent instrumental tests this morning, which showed a first degree distraction of the right external obturator muscle.
For the Greek there will now be 10 to 15 days off to heal.
Manolas will therefore miss the next challenges starting from today's Coppa Italia and also the Super Cup against Juventus.
Meanwhile, Napoli have recovered from the injury the other central defender Kalidou Koulibaly.