A seething Andre Villas-Boas revealed he lost it with referee Chris Foy after Chelsea's dramatic and controversial 1-0 west London derby defeat at QPR.
The Blues boss 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.
The 34-year-old's behaviour and subsequent outburst could land him a Football Association charge. He was also critical of decisions in their draw at Stoke, and 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."
He added: "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. Foy then controversially sent off Jose Bosingwa for a last-man challenge and was left with no choice but to dismiss Didier Drogba for a two-footed lunge.
He booked seven more Chelsea players, meaning the club can expect an FA fine, and Villas-Boas said: "A couple of decisions are right, yellow cards for sure. But I think he lost it before and was card happy towards the team."
QPR boss Neil Warnock, a habitual critic of referees, rubbed salt into the wound by praising Foy.
"I am so pleased that we had the referee because a lot would have been conned," the 62-year-old said, suggesting Villas-Boas' outburst betrayed a lack of experience.
"When you are beaten like that and have two men sent off, it's easy to blame the referee. When you're young, you do that. I've done that in the past.
"Our one was a penalty, and he might have missed a few shirt tugs, but Lampard made a meal of his shirt tug."