A smiling Cristiano Ronaldo insisted on Monday that he is an "example" in his behaviour on and off the field amid allegations of rape made against the five-time Ballon d'Or winner in the United States.

"I know I am an example, 100 percent, on the pitch and outside the pitch," Ronaldo told a press conference ahead of his return to Manchester United, where he spent six years as a player, with Juventus in the Champions League.