Ronaldo, who also won the Champions League with Manchester United in 2008, has scored a record 105 goals in the competition, 11 more than Barcelona's Lionel Messi, his nearest challenger.
Ronaldo, on Confederations Cup duty in Russian Federation with Portugal, is reportedly furious over a tax probe into the offshore accounts dealing with his image rights, and has reportedly vowed to leave Spain.
The report suggests Ronaldo told Fergie that he felt unloved at the club and has grown exhausted of his own fans booing him on certain occasions at a function before the Champions League final.More news: 26 injured as plane hits turbulence
Ronaldo, 32, is said to be miffed over claims by authorities that he defrauded the Spanish taxman of €14.7million during his time at the capital, an allegation he has refuted.
CR7, as he is fondly called, is ready to quit Real Madrid this summer after tax evasion charges were allegedly leveled against him by the Spanish tax office.
Sky Sports suggest United are not confident of striking a deal for Ronaldo, as they report that the Old Trafford club expect their former No.7 to resolve his difficulties in Spain and remain at Real Madrid.More news: Portugal captain Cristiano Ronaldo not concerned by Confederations Cup draw with Mexico
Real Madrid said on Thursday that they were confident the Portuguese forward had acted legally.
It remains to be seen how many Chinese clubs will be able to afford his transfer fee now.
Ronaldo has reportedly told his Portugal team-mates that he is "determined" to walk away from the Spanish giants and "there is no going back".More news: Zidane pleads with Ronaldo after 'I quit' bombshell
Ronaldo, who is at the Confederations Cup in Russian Federation with the Portuguese national team, is the latest in a long line of football players in Spain - among them Barcelona forwards Lionel Messi and Neymar - to be caught up in cases over tax or transfers. The pupil sporting played 292 matches and scored 118 goals and won nine trophies, including three titles of champion of England, winning the Champions League and the Federation Internationale de Football Association club world Cup.
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