The player is “calm in training” and “doing well” after being accused of raping a woman in 2009, his club Juventus says.
Cristiano Ronaldo is “ready to return to action” after being accused of rape, his manager at Juventus has said.
But the Italian football club’s share price closed almost 10% down as markets reacted to a damaging week for their star player.
Lucky number 7
Ronaldo's career in figures
Juventus boss Massimiliano Allegri said Ronaldo was “doing well” despite the allegation against him.
“I’ve known him for three months, but I can say that in his 15 years of his career he has shown great professionalism and seriousness both on and off the field,” Allegri said.
Ronaldo has 'firmly' denied the allegation against him
“In regard to tomorrow, he is ready to return to action.” Juventus are away to Udinese in the Italian league.
The defence comes after a video emerged of the Portugal footballer dancing with his accuser, teacher Kathryn Mayorga, in 2009.
Ms Mayorga, 34, has claimed Ronaldo raped her in June 2009 in a Las Vegas hotel room.
Allegri acknowledged that it was a “delicate moment” but said Ronaldo had “large shoulders”.
“I see him calm in training,” he said. “Ronaldo’s professionalism on and off the field is indisputable.”
Massimiliano Allegri says Ronaldo has been 'calm' in training
Nike, which has had a contract with Ronaldo since 2003, has said it is “deeply concerned by the disturbing allegations” facing the footballer.
In a statement, the company said it would “continue to closely monitor the situation”.
Another of Ronaldo’s sponsors, EA Sports, said: “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.”
Kathryn Mayorga claims she was raped by Ronaldo in 2009
In a statement issued on Thursday, the club described Ronaldo as a “great champion”.
Ms Mayorga has filed a lawsuit against the player, and police in Las Vegas have reopened their investigation.
The lawsuit claims she was coerced into signing a $375,000 (£332,000) out-of-court settlement with Ronaldo in 2010.
She wants the agreement to be declared void and says she gained the courage to speak out because of the #MeToo movement.
Ronaldo, 33, tweeted on Wednesday that he “firmly” denies the accusation – his first direct denial of the allegations.
“Rape is an abominable crime that goes against everything that I am and believe in,” the former Real Madrid and Manchester United player said.