Former Juventus CEO Luciano Moggi says Ronaldo has already completed his medical - in Munich - and signed off on his contract.
However, there has been no official statement from either Juve or Real Madrid.
Ronaldo is said to be house hunting in Turin ahead of him move, which will see the 33-year-old join the Italian champions on a four-year contract.
Manchester United sold Ronaldo to Real Madrid back in 2009 for a then-world record £80m fee.
The Red Devils arguably made Ronaldo the player he is today as he excelled at Old Trafford in his six years in Manchester.
Now at the age of 33, Ronaldo is expected to sign for Juventus in an £88m deal that will land him a four-year contract worth £105m.
And the transfer will benefit Manchester United and Ronaldo’s two other former clubs - Sporting Lisbon and Nacional.
That’s because all three of his previous clubs will be due cash thanks to FIFA’s Solidarity Mechanism.
The Solidarity Mechanism is a formula used to deliver compensation to clubs who invested in players between the ages of 12 and 23.
Cristiano Ronaldo joined United from Sporting in 2003 as an 18-year-old.
In the Solidarity Mechanism formula, clubs who helped develop a player are due a split of 5 per cent of any transfer fee.
Portuguese newspaper Record have crunched the numbers and worked out how much each of his former clubs will earn.
It works out as follows:
Manchester United: £2.2m
Sporting Lisbon: £1.98m
United do NOT have a sell-on clause in the 2009 deal that saw Ronaldo join Real.
United may be due £2.2m from Ronaldo’s transfer but they would rather have signed him.
Express Sport understands the Old Trafford club have watched Ronaldo’s situation closely.
But Juve’s surprise bid at the start of this week seems to have caught United - and fellow suitors PSG - unawares.
Spanish football expert Guillem Balague claims Ronaldo already feels like a Juve player.
“In his head, Cristiano is a Juventus player,” Balague wrote on Twitter.
“Juve has found a financial way to pay for his wages and fee. Real Madrid willing to let him go.
“No offer has arrived yet to Real, but Jorge Mendes has confirmed to Real that it will. He has never been this close to leaving. Will he?”
He then added: “Ronaldo wants to go, Juve optimistic about getting him and, Real?
“If he wants to go so desperately they will open the door. But ONLY for the right offer.”
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