The former Manchester United trainee had been at a nightclub with friends including Red Devils duo Tom Cleverley and Danny Welbeck before allegedly leaving alone.
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Simpson was photographed, apparently unconscious, on the floor outside.
Police arrived at the scene after hearing reports of an assault but say a man with minor injuries did not wish to make a complaint. An ambulance spokesman also confirmed that a man was taken to Manchester Royal Infirmary.
Simpson’s spokesman said: "Danny’s fine and will be back training tomorrow."