The forward lined up for Portugal in Monday's qualifying
At the time, Portugal
Ronaldo was instrumental in guiding Juventus past Atletico Madrid and into the Champions League quarter-finals, as the former Real Madrid star fired home a hat-trick to help the Italian side overcome a 2-0 first leg deficit.
Now, his status for that quarter-final, a clash with Ajax, is up in the air depending on the severity of his injury.
Juventus are set to take on Ajax on April 10 in the first leg in Amsterdam before returning to Turin for the second leg six days later.
Ajax sealed their spot in the quarter-final round by stunning Ronaldo's former club, Real Madrid, battering the Spanish giants 4-1 in the second leg at the
Before facing off with Ajax, Juventus do face a trio of Serie A matches at the conclusion of the international break.
Ronaldo has been pivotal to that Serie A lead, having scored 19 goals in 26 league appearances since joining the club from Real Madrid this past summer.
He's scored a further four goals in Champions League play as he looks to guide Juve on a tournament run having won the last three titles during his time in Madrid.
Ronaldo also started and played all 90 minutes on Portugal's Euro 2020 qualifying opener, a scoreless draw with Ukraine.