Manchester United and Crystal Palace fans will be banned from wearing their club colours in Wembley's corporate areas at the FA Cup final this weekend.
The Club Wembley and Bobby Moore Club areas are unsegregated with a restriction on wearing replica shirts in those sections of the stadium
But now the ban will be extended to include several other items, including replica shirts, hats or scarves and foam hands in club colours.
An email from Club Wembley to its members stated: "Should club colours be worn you may be refused entry or be removed from the stadium for your own safety.
"The restriction on wearing club colours and replica shirts does not apply to England matches or option events. If restrictions apply to other events further communications will be sent."