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The rules aren't very easy to follow at all, however the rule covering season/half season loans states that recalls can only be instigated during a transfer window. In the deal for Wilson I would imagine the change to a half season loan will happen at the end of the Jaunary Window so Man Utd...
We can recall O'Grady, only during the January window and only if we'd put that clause in the original loan deal.
From the Football League Website -
That is exactly what the deal will be, an emergency loan now until the transfer window opens and then it will become a half season loan.