Chelsea's assistant, Marco Ianni, became embroiled in a heated exchange during Manchester United's clash against Chelsea.
Ross Barkley's 96th minute equaliser sparked jubilant scenes in the Chelsea dugout, however Ianni perhaps took it too far. He has since been charged by the FA for indecent conduct.
Despite this, Chelsea winger Willian told 'Sky Sports News' that everybody "remained calm" during the melee.
"We just went to the tunnel to talk and to say to Mourinho to keep calm and then the same was said to our staff as well, then it was calm."
"It [the game] is very emotional and the guy I am sure he doesn't want to do something wrong, he doesn't want to disrespect the team," the Brazilian international said.
"He did that [celebration] because in the last minute we scored a goal and we needed this goal. He did this because he feel passion and that's why", he added.