The Mirror says Van Persie is facing surgery on a troublesome injury to his left knee which would rule him out for months.
That is the real reason behind Manchester United's move for Colombian superstar Falcao who is set to move to Old Trafford in a £16m one-year loan deal.
The package for Falcao includes a £6million loan fee for AS Monaco and his £200,000-a-week wages which will represent small change if they get back into the top four.
But the fitness blow to van Persie reveals why United went all out to get Falcao.
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