Courtney Lawes has become the third England player to be fined for wearing a branded gumshield during the Rugby World Cup.
The Northampton lock follows Manu Tuilagi and England captain Lewis Moody in being sanctioned for a breach of the tournament's strict commercial regulations.
Tuilagi incurred a NZ 10,000 (£4,800) fine after the victory over Georgia and the England camp were warned about increased fines for any future breaches.
As a result, it is understood that Moody and Lawes were fined double the amount.
A Rugby Football Union spokesman said the breaches were oversights and not intentional.