The summer transfer window might have closed but the rumour mill continues spinning and at the moment it's the Cristiano Ronaldo to Manchester United story that is doing the rounds.

The basis of the story is that Ronaldo is unhappy with Real Madrid's transfer policy - namely the sale of team-mates like Angel Di Maria.

Sky Sports pundit Guillem Balague gave the story some legs, suggesting that the Portugal star is seriously considering a return to Man United.

But is this all a storm in a tea cup? Our European football correspondent Graham Hunter joined us on the line to discuss the supposition and feels the aspect about Ronaldo feeling unhappy about transfer policy holds some water.

"It's become increasingly clear that Ronaldo feels that he is at a club where he's not consistently happy with a variety of things," said Graham.

Listen to the full interview above via the podcast player

"You have to accept that this is a player fired on by his burning ambition. He's not a guy who lives solely for money, fame or his looks. He's a guy whose always wanted to be the very best ever. By Di Maria's testimony, you know its the second time in 14 months that Florentino Perez has tried to push Angel Di Maria out. He did so unsuccessfully a year ago because Ronaldo petitioned the club and said 'I want him to stay' - just as he did with Benzema."

But will his frustration boil over to the point where he severs ties with Real?

"If the situation is next May as it is now, then you will have meat on the bones of this story and you'll have a proper bid from Manchester United."