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Barcelona and Juventus were drawn together on Thursday in the Champions League group stage.
The 35-year-old has missed one Portugal match and four Juventus games, including their Champions League clash with Barcelona, since he tested positive on October 13.
Juventus have won the title in the last nine season.
The 35-year-old Portuguese striker will miss Wednesday's UEFA Nations League game against Sweden but is "well, has no symptoms and is in isolation", the federation said.
The 35-year-old has scored 450 goals for Real Madrid, 118 for Manchester United, 102 for Portugal, 75 for Juventus and five for his first club, Sporting.
Juventus, with 66 points from 27 games and chasing a ninth successive title, extended their lead to four points over Lazio, who visit Atalanta on Wednesday.
Cristiano Ronaldo scored one and set up another two, with Paulo Dybala, Gonzalo Higuain and Matthijs de Light also on target for Juventus.
Juve qualified for Wednesday's final on away goals following their 1-1 draw in the first leg of the semifinal, played on February 13, and face Napoli or Inter Milan.
Cristiano Ronaldo comes in second although earnings of $117 million will soften the blow for the Juventus forward, as will his status as the most followed soccer player in the world on social media.
Nations League holders Portugal swept aside Croatia 4-1 in their opener.
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