The Football Association has written to FIFA to complain after an angry England fan gained entry to the dressing room following the disappointing goalless World Cup draw with Algeria.
England were booed off in Cape Town following a second Group C stalemate, which has left their hopes of reaching the last 16 hanging by a thread.
Afterwards the fan evaded security at the Green Point Stadium and barged his way into the dressing room where he reportedly confronted former skipper David Beckham, who has been with the squad in South Africa despite being injured.
"A fan got in past FIFA security," confirmed 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."
The incident followed a disjointed performance which has left England needing to win against Slovenia in their final group game next Wednesday to progress to the knockout stages.
Wayne Rooney again failed to perform and lambasted the booing England fans as he walked off the pitch at full-time.
Speaking directly to the television cameras, the clearly frustrated Manchester United striker said: "Nice to see your home fans booing you. That's loyal supporters."
It has again brought to the fore questions about the temperament of a player whose last World Cup four years ago ended in a red card for stamping on an opponent.