If the 27-year-old forward genuinely wants to leave, the reigning La Liga champions' asking price will tumble to less than half that amount, with a part-exchange deal involving United players bringing the fee down to £60million.
Spanish goalkeeper David De Gea, and want-away winger Nani are two names linked with a possible move to the Bernabeu, after The Sun revealed that Ronaldo had confided in his former Red Devils team-mates that he would love to return to Old Trafford.
Sir Alex Ferguson has admitted he's still in regular contact with the Portuguese protege, and their relationship is close.
A move back to Manchester United would be based on football reasons alone, with the Premier League giants only able to offer Ronaldo a maximum £300,000-a-week in wages - £200,000 less than what fellow admirers Paris Saint-Germain would be prepared to give the FIFA Ballon d'Or nominee.
Ronaldo still has two-and-a-half years to run on his existing Real Madrid contract, and of course these rumours of unrest could just be a pre-meditated bargaining ploy by player and agent, Jorge Mendes, to negotiate a lucrative new deal in Spain.
However, Manchester United fans will be excited by the prospect of seeing Ronaldo back in a Red shirt next season, depending how the situation unfolds.