Manchester United players surrounded referee Michael Oliver after he pulled out a second yellow card for Ander Herrera following a challenge on Eden Hazard.
And The FA have slapped United with a £20,000 fine for failing to control their players.
Jose Mourinho and Chelsea boss Antonio Conte had to be separated on the touchline following a heated exchange as well.
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Manchester United players surrounded the referee after Ander Herrera was shown a red card
Herrera will miss United's next two Premier League matches against Middlesbrough and West Brom.
Marcos Rojo was also sweating over retrospective action after footage emerged which appeared to show him stamp on Hazard's chest.
But referee Oliver had confirmed that he saw the incident in his post-match report, meaning the case cannot go to a review panel.
An FA statement read: "Manchester United have been fined £20,000 after the club admitted an FA misconduct charge and accepted the standard penalty.
"It relates to a breach of FA rule E20(a) for failing to ensure its players conducted themselves in an orderly fashion in or around the 35th minute of their Emirates FA Cup quarter-final against Chelsea on Monday 13 March 2017."
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