The Football Association is to investigate comments by Chelsea manager Jose Mourinho and John Terry after the Carling Cup tie with Manchester United.
Mourinho accused Manchester United of cheating, while Terry attacked referee Neale Barry, complaining: "It seemed as though he didn't really give us much."
Chelsea boss Mourinho said: "After the break it was whistle and whistle, fault and fault and cheat and cheat".
The FA confirmed it was aware of the remarks and they were being considered.
Mourinho escaped FA punishment after claiming referee Neale Barry had been influenced by Sir Alex Ferguson at half-time in the goalless draw.
But after his comments on Chelsea TV, Mourinho risked an FA charge by using the word "cheat".
Arsenal manager Arsene Wenger was recently fined £15,000 by the FA for calling Ruud van Nistelrooy a "cheat" after their 2-0 defeat at Old Trafford earlier this season.
Terry backed his manager when he said: "It seemed as though he didn't really give us much. With most refs and being captain, you can maybe have a word, but he just wasn't willing to listen which was disappointing.
"If he is not willing to listen then you just have to let him get on with it. I tried to speak to him just to say 'be fair and give us a bit'.
" I wasn't whingeing about not getting anything, or any of the decisions, but you just want the referee to be fair and I don't think he was."