Wayne Rooney has been warned over his future conduct after appearing to mouth the words "12th man" to a television camera after Manchester United's defeat to Chelsea at Stamford Bridge on Sunday.
Many of the United players were unhappy with the decision to award Chelsea a free kick after a robust tackle from Darren Fletcher, and Rooney was booked for his protests after the the goal that beat United.
An FA spokesman said: "Wayne Rooney has been warned as to his future conduct following remarks made on Sunday."
Manchester United manger Sir Alex Ferguson has been told today that he will not face any charges for his comments after the game regarding referee Martin Atkinson. Ferguson said in a post match interview:
"You lose faith in refereeing, that's the way the players see it".
The defeat leaves United in 3rd place, level on points with Arsenal who have a game in hand.