Ronaldo, 33, has been accused of sexually assaulting Kathryn Mayorga at a Las Vegas hotel in 2009.
Mayorga says she was attacked by the Portuguese footballer in a hotel room in the US city that year - but was pressured to sign a non-disclosure.
A statement from Ronaldo's new lawyer Peter Christiansen reiterated the Portugal captain 'vehemently denies all accusations in this civil action'.
"What happened was simply that Cristiano Ronaldo merely followed the advice of his advisors in order to put an end to the outrageous accusations made against him, in order precisely to avoid attempts, such as those we are now witnessing, to destroy a reputation built thanks to hard work, athletic ability and behavioural correction.
"Unfortunately, it is now involved in the type of litigation that is very common in the United States," Christiansen added.
"Although Cristiano Ronaldo is accustomed to media attention, inherent in the fact that he is a famous person, it is absolutely deplorable that the media continue to propagate and stimulate an intentional defamation campaign based on stolen and easily manipulated digital documents.
"Cristiano Ronaldo has mandated his lawyers in the United States and Europe to deal with all legal aspects and expresses full confidence that the truth will prevail, despite the corruption of counter-information, and in which the laws of Nevada will be enforced and respected."