The five-time Ballon d’Or winner immediately left the national team after returning a positive test and will miss Wednesday’s match against Sweden.
The news comes just days after the superstar played for Portugal against France in the Nations League and Spain in an international friendly last Wednesday, meaning that he has come into recent contact with a host of football’s top stars.
There is also concern for his team-mates after Ronaldo posed for a picture just hours before the news was announced, with the Juventus star smiling for a selfie at dinner.
It has been confirmed that the 35-year-old is asymptomatic and is now self-isolating while he recovers.
The news was confirmed in a statement from the Portuguese FA, which reads: ‘Cristiano Ronaldo was released from the work of the National Team after a positive test for COVID-19, so he will not face Sweden.
‘The Portuguese international is doing well, without symptoms, and in isolation.
‘Following the positive case, the remaining players underwent new tests this Tuesday morning, all with a negative result, and are available to Fernando Santos for training this afternoon, in Cidade do Futebol.’