The Red Devils have been linked with a move to bring their former idol back from Real Madrid next year following rumours that the winger is unsettled at the Bernabeu.
Ronaldo is thought to be angered at the sales of Xabi Alonso and Angel di Maria in recent months and the emergence of a number of players in European football on a higher wage than him.
United are seen as the most likely suitors for CR7, but they will not spend over £120m all told on a player who will soon turn 30.
Ronaldo is thought to want wages close to a staggering £300,000-per-week and would command a massive transfer fee of about £60m, which is seen as silly business at Old Trafford.
The Portuguese wide-man is one of the most marketable players on the planet, but even with that factored in United are reluctant to spend such a fortune.
Real are struggling with big debts, which are expected to be confirmed to be around £400m.
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