Last month, Ronaldo hinted at a Real exit by saying: “It was very nice to be at Real Madrid.”
Those comments reportedly irked Sergio Ramos and the report suggests that Gareth Bale and Isco also feel that Ronaldo must now stick to his guns and depart.
But Express Sport understands that he has always been on the radar of United CEO Ed Woodward.
Piecing the puzzle together, it means that, if Ronaldo becomes available, the Red Devils can be expected to pursue his signature.
PSG have also been tipped to sign him.
Cristiano Ronaldo: Real Madrid boss Julen Lopetegui is willing to sell Ronaldo to Man Utd (Image: GETTY)
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Real Madrid won't let Ronaldo go 'cheap' to Man Utd claims expert
But Ronaldo has dropped numerous hints via various parties that a United return is his priority.
The player has always ensured he maintain a close rapport with Red Devils fans.
And, speaking recently, his mother dropped a hint by saying “I like Paris. I come every now and again.
“The last time was when my son received the Ballon d'Or.
“It was a great honour. When I arrived I was treated well by everyone.
“Convince Cristiano to sign for PSG? To be honest, it wouldn't annoy me [if he did].
“But I would prefer him to return to Manchester United.”