Napoli players face disciplinary action after several were out late before their defeat to Udinese.

The 3-1 loss at the Stadio Friuli was disappointing and new reasons behind the poor performance are emerging.

"There was something unacceptable and inopportune," director general Marco Fassone told Radio Marte.

"The club will take disciplinary action against the players and they intend to accept it."

It was reported that several unnamed stars were spotted out partying very late on Friday night, while the game was played on Sunday afternoon.

"I want to clarify the situation. We made our own investigation, spoke to the players and the squad. There was indeed an incident.

"Some players had dinner and then went to see a show on Friday night. I want to clarify there was no 'night on the tiles' and nobody was drunk.

"This behaviour was, however, inopportune and all the protagonists were called upon to act with more professionalism."