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Pato is expected to one day return to Milan if he can repair the injury issues and find a steady run of form.
In fact, according to Silvio Berlusconi, his daughter's boyfriend has promised to return to the club within the next two years, despite signing a four-year contract with Corinthians (via Sambafoot).
Berlusconi's comments add to the speculation that there may be a clause in the deal between Milan and Corinthians that would allow Milan to bring Pato back without any controversy. No confirmation of such a clause has ever been presented, but it is still likely that Milan would be Pato's first choice of destination if he were to return.
If Pato can find his best form and get over the injury crisis that has been his career, he can become a lethal scorer once again and Milan can reap the benefits if they so choose.
In order to return to stardom, Pato's departure was necessary. If he wants to return, expect him to be welcomed with open arms by the club.