Portugal coach Fernando Santos cannot explain how Cristiano Ronaldo came to be infected with the coronavirus while with the national squad in the international break.
"Since Monday we have been completely locked in," Santos was quoted by Portuguese media on Wednesday. "The workers and players have come in and otherwise no one."
Ronaldo, 35, had his positive test revealed by the Portuguese federation on Tuesday and will miss Wednesday's Nations League match with Sweden in Lisbon.
The Juventus forward will also miss club games including in the Champions League as he isolates.
Santos said Ronaldo was "doing well" and was symptom free. He too does not understand "how it could have happened," the coach added.
