Jose Mourinho has been charged by the Football Association for suggesting that referees have been influenced in a "campaign" against Chelsea.
Mourinho could not keep his cool in a post-match press conference after seeing his Blues team denied a penalty in the 1-1 draw with Southampton on December 28. Cesc Fabregas had gone down under the challenge of Matt Targett but was booked for diving.
Replays suggest that referee Anthony Taylor had got the decision wrong, incensing the Chelsea boss. He later claimed that pressure from various external groups had pressured Taylor into making the mistake.
"There is a campaign against Chelsea. I don't know why there is this campaign and I do not care"
He told BBC Sport: "The media, commentators, other managers are all doing it [putting pressure on referees]."
Then later telling reporters: "There is a campaign against Chelsea. I don't know why there is this campaign and I do not care. Everybody knows it was a penalty."
The FA have given Mourinho until 18:00 GMT on 13 January to respond to the charge. Chelsea have since announced that the Portuguese will not attend Friday's press conference ahead of the weekend tie against Newcastle United.
"It is alleged his remarks constitute improper conduct in that they allege and/or imply bias on the part of a referee or referees and/or bring the game into disrepute," the FA stated.
It could have been a lot worse for Chelsea, as the FA confirmed that Mourinho would be given just a warning for his call for referee Neil Swarbrick to produce a strong performance ahead of a 2-0 win over Stoke on 22 December.
Should Mourinho receive a touchline ban, it could be a massive blow to Chelsea's title chances with the Blues already struggling to steady a rocking ship at Stamford Bridge. It is the latest controversy to come from Mourinho after his side has not won a game.
Mourinho has a reputation of failing to control his emotions after a bad result. In 2005 he claimed Barcelona manager Frank Rijkaard had visited the room of referee Anders Frisk at half-time.
His time at Real Madrid was piled with bemoaning comments towards Barcelona and caused uproar last April after "congratulating" Mike Dean in a sarcastic message after seeing his side lose 2-1 to Sunderland at Stamford Bridge.