The England winger has struggled to make much of an impact at Old Trafford since his £73million transfer from Borussia Dortmund over the summer.
"It's a big, big, big price tag for him and it feels a bit heavy for him at the moment.
"But he will look at this guy [Ronaldo] and he can say, 'If I do something along those lines, I can be as good as him. I have all the basics, but I can be as good as him.'
"That might take him two, three years to catch on to that but that then gives him maybe ten, 12 years after that.
"This is what Ronaldo gives. I was celebrating when I heard he was returning, running around like crazy in my garden even though I can't run. But I did.'
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