Manchester United boss Jose Mourinho and Liverpool's Jurgen Klopp clashed at the end of Sunday's 1-1 draw.
Klopp was furious with Mourinho for trying to get his man Roberto Firmino sent off.
United midfielder Ander Herrera pulled back the Brazilian while he was breaking clear up the pitch.
Referee Michael Oliver awarded a foul and Firmino pushed Herrera in the face.
Both players were shown yellow cards, but Mourinho seemed to want red.
He let it be known on the touchline - and that infuriated Klopp.
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