The English Football Association has complained to the sport's governing body after an angry fan barged his way into the dressing room and confronted David Beckham.
England were booed off after their 0-0 draw with Algeria yesterday left their World Cup hopes hanging by a thread.
One supporter was so angry he evaded security to remonstrate with the former skipper, who has been a constant presence since England's arrival in South Africa.
The intruder was hustled away but the England squad were unnerved by the incident which came at the end of an awful evening.
Having brought their own security people with them to South Africa, the incident was particularly worrying because both Prince William and Prince Harry, who have been on a tour of southern Africa, had been present in the dressing room, but left before the security breach.
And the FA are in no doubt where the responsibility lay.
"A fan got in past Fifa security," said an FA spokesman.
"We have formerly complained to Fifa after the game and will follow it up in writing.
"This is not acceptable and thankfully no serious harm was done."
A tepid display from Wayne Rooney and company against Algeria muted a raucous Friday night for millions of fans watching in England.
Fabio Capello's men must beat group leaders Slovenia in the final game of the group stage to guarantee progress to the second round.
Soccer: England protest over fan's security breach
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