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.

Villas-Boas' behaviour and subsequent outburst could land him a Football Association charge but the 34-year-old appeared not to care a jot as he hit out at what he claimed was the unfair treatment of his side this season.

Villas-Boas, who last month called referees' chief Mike Riley to complain about the performance of the officials in Chelsea's Barclays Premier League defeat at Manchester United and was also critical of decisions in their draw at Stoke, 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.

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.

"I'm not happy with the difference of treatment. I don't think the same treatment was applied.

"Apart from the fourth official, the other three were led by the emotions of the crowd and couldn't deal with a game like this."

He added: "Three of the games played by Chelsea were influenced by the referee, and this is not Premier League level.

"You have to trust human error, but it's a big pattern for us. Things are not going our way.

"Conspiracy theories can lead to bans and lead to you calling us cry babies, and we're not. But it keeps happening.

"We're showing commitment and strength. Hopefully, things will go our way, referee decisions going our way."

Villas-Boas had no problem with the penalty or Drogba dismissal but insisted Bosingwa should not have gone for a last-man challenge as John Terry was in a position to cover.

He also claimed his own side should have had a spot-kick for a tug on Lampard and hailed them for their performance with nine men.

"We were superior throughout the game, even with nine men - the best opportunities fell to us," he said after watching his side blow the chance to leapfrog Manchester United and cut the six-point gap to Manchester City.

"I was very, very proud of the team today.

"We have two clashes with City where we can make things up eventually."

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."

The win was Rangers' first against their arch-rivals for 16 years and was also their first Premier League home victory since promotion.

Warnock said: "It's the greatest day of my career, because of the importance to the fans.

"I know they've had two men sent off, but it's still difficult coming up against that.

"We stressed before the game that it wasn't an ordinary match. We started well, got about them and deserved the goal when it came.

"They're a great side even with nine men, but we missed opportunities to finish the game off.

"We had to show a lot of character and guts today. These top sides aren't used to having their feathers ruffled.

"They'll be talking about this in 30 or 40 years. We've shocked a few people today, especially the bookies."