Greater Manchester Police are investigating an allegation of common assault against Jose Mourinho following Wednesday night's Champions League tie between Manchester United and Inter Milan at Old Trafford.
It has been alleged Mourinho punched a supporter close to the Inter team bus as he left the stadium following his side's 2-0 defeat.
"Shortly before midnight a man reported that he had been punched in the face outside Old Trafford," a police statement read. "We are investigating an allegation of common assault."
GMP have contacted United to request CCTV footage of the area and have confirmed a complaint has been made.
United would only confirm they are aware of the allegation and are making no further comment.
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