Chubby Chandler, whose International Sports Management represents the likes of Ernie Els, Lee Westwood and Darren Clarke in golf as well as England cricketer Freddie Flintoff, told the Sunday Mirror: "Ronaldo will do what Tiger has done and tick every box in the book. Woods appeals to everyone: male, female, no matter if they are golf-lovers or not. Ronaldo will be the same.
"If he was in my stable then over the next decade he'd earn £150million - and that's a conservative estimate.
"He is not just a phenomenal player, he's big, handsome, has that special smile and a Latin look and that would sell him big-style in the States.
"To really cash in you have to have transatlantic appeal and boy, has he got it. Can he be the Tiger Woods of football? No doubt at all." United fan Chandler adds: "Once they said we would never see the £100,000-a-week footballer.
"Well, I reckon he is on target to be the first £200,000- a-week star of the game."
"The sky is the limit for him but there is one thing - he should stay with United because they are such a huge, global brand.
"If I was going to advise I'd say first to forget any thoughts, long-or short-term, of leaving Old Trafford and ignore any talk of Real Madrid.
"I would tell him to sign up with Simon Cowell and I promise you that within a year Ronaldo would be a world-wide figure off the park as well as on it.
"Football tends to be only interested in itself. Huge though Ronaldo is, he is still not known very well outside the sport. Simon, or someone with his contacts, would change all that. He'd find him placements on TV shows in the States, for instance - such as American Idol, even walk-on movie parts.
"He would place him in big charity shows. He would coach him on how to handle himself in the public glare, protect him from the wolves - which is what Simon Fuller did with Beckham."