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5. Jose Mourinho
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Yes, as mad as it may sound right now, you can surely never rule out Jose Mourinho becoming Manchester United's manager. His time at Chelsea seems like it will be relatively long, but you can just never tell when he will fall out of love with the club, players or an owner. That said, perhaps United would feel it would look weak to appoint Mourinho as the replacement of the man they picked over him in the summer.