Courtney Lawes has been fined for using a branded gumshield while playing for England at the Rugby World Cup.
The Northampton lock follows Manu Tuilagi and captain Lewis Moody in being sanctioned for a breach of the tournament's commercial regulations.
Tuilagi was fined £4,800 and England were warned about increased punishments for any future breaches.
As a result, it is understood that Moody and Lawes were fined twice as much as their team-mate.
A Rugby Football Union spokesman said the incidents were oversights and not intentional.