Kathryn Mayorga accused the player of sexual assault in her hotel room in 2009 via an interview released last Friday by Der Spiegel.
Las Vegas Police Department (LVPD) have since confirmed that they are reopening the case but Juve, who signed Ronaldo from Real Madrid in the summer for £100m ($128m), have vowed to stand by their player via statements posted on social media.
“Cristiano Ronaldo has shown in recent months his great professionalism and dedication, which is appreciated by everyone at Juventus,” the Turin giants said via Twitter.
“The events allegedly dating back to almost 10 years ago do not change this opinion, which is shared by anyone who has come into contact with this great champion.”
The statement comes in the way of a denial from the player, who said: “Rape is an abominable crime that goes against everything that I am and believe in.
“Keen as I may be to clear my name, I refuse to feed the media spectacle created by people seeking to promote themselves at my expense.”