Sir Alex Ferguson would always welcome Cristiano Ronaldo back to Manchester United but admitted the forward is now "unbuyable".

The Portuguese spent six years at Old Trafford before moving to Real Madrid in 2009 where he has continued to enjoy success both individually and as part of the team that last year wrested the Primera Division title away from Barcelona.

Were it not for the brilliance of Barca's Lionel Messi, Ronaldo would surely wear the mantle of the world's greatest footballer with the pair both transcending the sport.

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