England, who subsequently exited the tournament in the group stage, lost the game 2-1 in Sao Paulo as Uruguay striker Luis Suarez scored two goals.
The victim was left with half his left ear ripped off in the incident, the Association of Chief Police Officers confirmed.
"We were made aware during the England v Uruguay match in Sao Paulo that an incident had taken place which resulted in an England fan having a portion of his ear bitten off by another England fan," said Chief Superintendent Rachel Barber.
"In the immediate aftermath, we managed to make contact with the victim and offered advice and support.
"The day after the attack, the victim chose to make a formal complaint to the local police, and they opened an investigation."
No arrests have been made but interviews with witnesses have given police a name for the alleged attacker, added Ms Barber.
A Foreign Office spokesman said: "We are aware of an incident in Sao Paulo on June 19 involving a British national and we provided consular assistance."
@ted maul - Perspective. A gnash on the shoulder that doesn't draw blood is very different to the savage attack in the stands where an ear lobe is violently bitten off. Hope they find and punish the scum that were responsible. A leg breaking tackle could sideline you for a long time, never heard of anyone missing a game with an ear lobe injury though. The volume of comments and level of disgust/hatred after this and the subsequent Suarez incident tells its own story. One is by far a more heinous crime than the other but the media/public are happy to let one slip through relatively unnoticed. Does anyone know if the missing piece of ear was found or - heaven forbid - was it swallowed?? Urgh- avspitfire