Jose Mourinho says Manchester United would be unable to turn down the opportunity to sign Cristiano Ronaldo back from Real Madrid.

Mourinho doesn't believe Real Madrid is interested in selling him.

"I consider that Real Madrid cannot sell, they can't," Mourinho told Portuguese newspaper Record in quotes reported by EFE. "It's prohibitive. He has to stay until the time when they authorise him to go and play one year to America or any other place where he wants to go. The door is closed. That is the impression I have.

"Everyone knows his history at Manchester, the passion they have for him, and that there are players in the world who, if clubs have the possibility of signing, will not say no."