Cristiano Ronaldo is one of four Juventus players who could face prosecution after breaking local lockdown regulations in order to join the Portugal camp.
Ronaldo, along with Paulo Dybala, Juan Cuadrado and Danilo, has allegedly been reported to the Local Health Authority after he left his confinement at a Turin hotel in order to honour a call-up from the Portugal national team.
The Bianconeri squad have all been compelled to self-isolate in a hotel or in their private homes following a sharp rise in COVID-19 cases in the region, which resulted in Juve's recent clash against Napoli being abandoned.
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"It was the same Juventus that told us that some players had left. Therefore we notified the competent authority," Roberto Testi, director of the Local Health Authority, told Spanish publication Sport.
"We will notify the competent authority, which is the Prosecutor's Office, of what happened."
Italy internationals Giorgio Chiellini and Leonardo Bonucci are reportedly staying in the same hotel but face no further action as they remained confined ahead of the Azzurri's friendly against Moldova on Wednesday night.
There is no indication as to what possible punishment Ronaldo, Dybala, Cuadrado and Danilo may face at this stage, if any.