This was reported on the website of the Italian Football Federation.

On October 4, Juventus announced the starting line-up for the home game against Napoli and showed up at the stadium, while the away team did not announce their list of players and did not come to the match as a result. 

Prior to that, two Napoli players, Elif Elmas and Petr Zielinski, contracted coronavirus, which is why the Neapolitans were not recommended to fly to the match with Juventus.

After that, "Napoli" could not fly to Turin, as the team was not allowed on board the plane. 

Earlier it was reported that Juventus and Napoli may not let their players go to the national teams.