Chelsea boss Andre Villas-Boas admits he lost his rag with ref Chris Foy after their defeat to QPR.
AVB admitted he was "very aggressive" with Foy after accosting him post-match at Loftus Road, and accused the official who sent off two of his players of failing to treat both teams equally.
He said: "The ref was poor, very very poor. And it reflected in the result.
"I spoke to him at the end and I was very aggressive to him.
"I don't care if he's okay or not.
"Everyone can have a bad day, but this was not a bad day for us. It was a good day for us and a bad day for the referee."
QPR won the game 1-0 thanks to a Heidar Helguson penalty that was awarded for a needless David Luiz challenge in the eighth minute.