The allegations against Juventus winger Ronaldo were first published by German news outlet Der Spiegel as the result of their investigation.
Ronaldo's powerful, angled goal, the second of the match and his fourth of the season, was met by applause and boos in the Italian league game at the home of Udinese. Mayorga went to the Las Vegas police a day later, but said she was hesitant to name Ronaldo in the accusation due to fear of his fame and influence.
"CRSexe", was the front-page headline on Rome-based Corriere dello Sport on Saturday, referring to the allegations.
Following the report, police have also re-opened an investigation.
Nike said it was "deeply concerned" by the allegations made against the Juventus star, who has a reported $1 billion endorsement deal with the USA sportswear giant.
The back page was dominated by an advert for Ronaldo's line of underwear, featuring a full-page photograph of the player bare-chested.
Ronaldo has strenuously denied the claims, and Juventus have so far stood behind the 33-year-old superstar, who moved to Turin in the summer in a 100 million euro ($115 million) deal from Real Madrid.
The reputation specialists, the lawyers claimed, were employed by Ronaldo in the UK, US and Portugal to discredit Mayorga and her claims that she was sexually assaulted by the footballer in Las Vegas in 2009.
"I firmly deny the accusations being issued against me". But sponsors Nike and video game maker EA Sports have expressed concern about the allegation.
Prior to that the European champion was accused of rape Katherine smacked silly by Mayorga from the United States in 2009, but she was silent all these years for financial reward: Ronaldo paid her is $ 375,000. "We are closely monitoring the situation, as we expect cover athletes and ambassadors to conduct themselves in a manner that is consistent with EA's values". On Friday, they closed down 9.92 percent at 1.19 euros on the Milan stock exchange.
Ronaldo is now cooperating with the Las Vegas police as it investigates Mayorga's claim, having been interviewed twice by law enforcement in recent months. She previously had signed a non-disclosure agreement, and a court will need to rule it invalid for her lawsuit to advance.