Sutton detectives have released an image of a man they want to speak to in connection with an assault following an Under 16s football match at the Croygas Sports Club, Mollison Drive, Wallington, on Sunday, 8 May at around 13:00hrs.
The players were leaving the pitch when a 35-year-old man was punched in the back of the head by a suspect holding a set of keys.
The punch caused a small cut. The victim did not require hospital treatment.
The match was between Croygas and Kew Association.
If you have any information, contact Sutton Police station on 101 quoting ref no: 4005109/16. Alternatively, contact Crimestoppers anonymously on 0800 555 111.