Manchester United fans wish for the same thing every summer transfer window: for Cristiano Ronaldo to finally complete a return to the club.

It's been eight years since the Portuguese departed for Real Madrid, during which time he's won La Liga twice, the Champions League three times and a further four Ballon d'Ors.

Ronaldo claims he's the best player in the world - heck, even the best there ever has been - and while that's up for debate, he owes a lot of his success to United.

He was signed from Sporting Lisbon as a fresh-faced teenager in 2004 and quickly developed into one of the deadliest forwards on the planet.

Now approaching the age of 33 and in the twilight years of his career, Ronaldo has won pretty much everything there is to possibly win for both club and country.

So perhaps it really is time for Ronaldo to return to United; to go back to where it all started.

Well, according to Duncan Castles, the Portuguese has been speaking to his superiors in Madrid recently and made an exciting demand to potentially force a move next summer.

Writing for the Daily Record, Castles claims Ronaldo has asked for his selling price to be set at €100 million (£89 million) or lower to make him more affordable for potential suitors.

Ronaldo is interested in joining two clubs next summer: United and Paris Saint-Germain, who have both been informed he's prepared to "fight for a move".

The 32-years-old's current contract contains a €1 billion (£887 million) release clause, which he realises is unrealistic and needs reducing.

All this reinforces the notion that Ronaldo is unhappy at Real. Castles also reports that he "doesn't even want to talk to" president Florentino Perez.

Castles has previously been wrong about Ronaldo rejoining United, of course, but there's reason to believe the Portugal international now wants a big-money return in the near future.

Brace yourselves, United fans.