EA Sports, for whom Ronaldo is a leading figure in their phenomenally successful Federation Internationale de Football Association video game market, also described the allegations as "concerning". What did Nike and EA Sports say?
The company homepage still uses athletes to represent NFL, NBA, NHL, UFC and golf games.
Ronaldo is a five-time victor of FIFA's men's player of the year award. "I see him calm in training", Allegri said.
EA appears to have removed Ronaldo from its promo material..
"We are deeply concerned by the disturbing allegations and will continue to closely monitor the situation", Nike said in an email to the AP.
"Being able to do so would ultimately depend on the contractual terms, and whether the sponsors can demonstrate that any such incident should have been revealed prior to entering into a contract with the sponsor".
"We have seen the concerning report that details allegations against Cristiano Ronaldo", an EA rep told Eurogamer.
On Thursday, Juventus sent a statement of support and called him a "great champion".
Ronaldo missed Tuesday's Champions League match against Young Boys because he had previously been suspended after getting a red card in an earlier match.
"I've known Cristiano for three months now and for over 15 years of his career he has shown to be a great professional both on and off the pitch", he said at a news conference.
The Italian side signed Ronaldo from Real Madrid for 112m euro (£99m; $130) in July - a move which helped the club's share price soar 180% to a peak of more than 1.80 euro a share in September.
But on Friday over five per cent was wiped off the value of their shares in morning trading on the Milan stock exchange.
This makes two major corporations that have shown concern over the Juventus star's alleged misconduct.
Under pressure from Ronaldo's "fixers", Mayorga settled the case "in exchange for a payment of United States dollars 375,000 and non-disclosure of the sexual assault", the lawsuit said.
In a lawsuit, Ms Mayorga says she met Ronaldo at the Rain Nightclub in the Palms Hotel and Casino, and that he raped her in his penthouse suite. How has Ronaldo responded? .