England lost the match 2-1.
British police in Brazil have been made aware of the incident.
Chief Superintendent Rachel Barber said: "We were made aware during the England vs 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.
"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."
The police are yet to make an arrests, as confirmed by Gary Duffy of BBC Brazil.
- Sports & Recreation