Surrey Police are appealing for information after a man was punched in the face while watching an under 17s football match between Horley and Epsom and Ewell.
The incident took place at around 2pm on Sunday 13th January at a football ground on Thornton Close in Horley.
A man in his 40s was taken to East Surrey Hospital with facial injuries following the incident.
Investigating officer Detective Constable Errol Chetty from Reigate CID, said: "I would appeal to anyone who attended the match between Horley and Epsom and Ewell who witnessed the assault or the events leading up to it to contact officers with information.
"There were plenty of people in the vicinity at the time of the incident which has left the victim requiring hospital treatment and we need establish the full circumstances surrounding the assault and take appropriate action against those responsible."
A man in his 40's from the Epsom area was arrested a short time after the incident. He was arrested on suspicion of assault and has been released on bail while the investigation continues.
Anyone who has information on this assault is urged to contact Surrey Police on 101 quoting reference RB/13/345 or the independent charity Crimestoppers anonymously on 0800 555 111.