Louis van Gaal has admitted publicly that Manchester United are interested in signing Cristiano Ronaldo, saying a deal "is possible".
Speculation has been mounting over a sensational return to Old Trafford for the current Ballon d'Or holder.
The Portugal international is understood to be disgruntled at the Bernabeu, having seen his wages slip behind others at the top of world football. Among those now being paid more are his former team-mate Wayne Rooney and the summer arrival at Old Trafford, Radamal Falcao.
In a recent interview, Ronaldo himself hinted at a possible return to Old Trafford.
"I love Manchester," he said. "Everyone knows that - I have said it many times. Manchester is in my heart. I left many good friends there, the supporters are amazing and I wish I can come back one day."