Soccer:Chelsea boss Andre Villas-Boas was unrepentant today over his attack on referee Chris Foy after the west London derby, insisting he had done nothing to warrant a English FA charge.

The FA wrote to Villas-Boas this afternoon asking for an explanation for his criticism of Foy and the official’s two assistants following Sunday’s dramatic Premier League defeat at QPR.

Chelsea were also charged with “failure to ensure their players conducted themselves in an orderly fashion” after some of them appeared to surround Foy when Jose Bosingwa was red carded.

The Blues were given until Friday to respond on both counts, after which Villas-Boas could be hit with a charge for accusing the referee of not treating both sides equally and of being “card happy”.

Villas-Boas admitted on Sunday that he was “very aggressive” with Foy after accosting the official post-match, having watched Bosingwa and Didier Drogba dismissed and seven more of his players booked at Loftus Road.

That landed Chelsea with an automatic £25,000 fine, which is bound to increase if they are found guilty of today’s charge. Villas-Boas, who claimed referees had been unfair to his side during previous games this season, could also end up fined or even suspended for his post-match outburst.

But speaking shortly before the FA announced they were taking action against the Blues, the 34-year-old stood by his words, something that could land him in even more trouble.

“I don’t think I said anything I shouldn’t have,” Villas-Boas said. “I would never question the referee’s integrity. But the fact is that, at the moment, we are paying heavily in terms of major decisions.

“Maybe this is what the FA (don’t) want to hear from me — phrases like, ‘The referee has influenced heavily three of our games’.”

Villas-Boas accepted officials were only “human” but reiterated his attack on what he claimed was inconsistency in Foy’s “extremely unfair” decision-making.

“If you go one route, you have to stick to it for the rest of the game,” he said. “With 11 players, we should have played better and there are mistakes we have to avoid and which are fair — you have to be criticised and evaluate yourselves and learn from those mistakes — but it’s a very disappointing day for the referee, for Chris Foy. I will stick to my words.”

He added: “Chris, for this particular game, was card happy and didn’t show a pattern to what he’s done in the past. What happened in that game was surprising given what he’d done before.”

Villas-Boas also hit back at QPR midfielder Shaun Derry’s claim that Chelsea “lost their heads” on Sunday, and branded suggestions they had been bullied as “ridiculous”.

“Fantastic Shaun Derry,” Villas-Boas snapped sarcastically. “You could ask Shaun Derry whether, playing against nine men, they might have done a bit better. Full praise to their commitment and to their strength, but they don’t have to blow it out of proportion because we won’t.”

He also backed John Terry in the wake of an alleged racist slur against Anton Ferdinand. Terry is still waiting to hear if Ferdinand is to make a formal complaint about his altercation with the England captain.

Terry has categorically denied racially abusing Ferdinand, who he admitted had accused him of making a racist remark but insisted his own response was actually a denial.

Ferdinand has yet to come out in support of that chain of events, while the police confirmed they were investigating an anonymous complaint made against Terry.

But Villas-Boas said: “He has put out his statement and we fully back John. John is a player who (represents) this country to the highest level internationally. He is a player of great responsibilities.”

He added: “He said to me the incident was a big misunderstanding. That’s why he put his statement out straight away. I find it strange when people don’t trust the words of a representative from your country.”

Villas-Boas also claimed Terry and Ferdinand cleared the air in the Chelsea dressing room after Sunday’s game.

“Anton was present in our dressing room,” he said. “For us, it was end of story and it still is. It’s just a misunderstanding and something blown out of all proportion. People who represent this country should have better and fuller support.”

Villas-Boas added: “The clubs are in touch with each other. We have full backing for our player. The rest, we have to wait and see.”