Jose Mourinho has suggested Manchester City play by different rules to Chelsea.
The Financial Fair Play regulations imposed by European governing body UEFA are designed to ensure that clubs spend within their means. City accepted sanctions at the end of last season for breaching the rules, among them a fine and restrictions on the club's Champions League squad.
However, that has not stopped the Blues from this week spending £28m to sign Wilfried Bony from Swansea.
Mourinho congratulated his title rivals for their acquisition, albeit with a less-than-veiled dig at such transfer activity.
"Well done, well done - good player, good striker, if they have the money and can spend it and have no problems with Financial Fair Play, well done," he said ahead of Chelsea's trip to Swansea.
"I think they can only play with 11, unless the rules for them are different and they can play with 12.
"It looks like the rules are different for them in certain aspects, but not this one. If Bony plays and Dzeko is on the bench, I am happy with that.
"Fantastic squad, one more top player for that squad to have Aguero, Jovetic, Dzeko and Bony is absolutely magnificent. I repeat, well done."
Asked what other aspects are different for them, Mourinho retorted: "You know what I mean."
Mourinho also expressed his belief that referees are being put under excessive pressure when speaking to the media for the first time since being hit by a Football Association misconduct charge.
Last week, the Portuguese was charged for comments made about match officials following the Blues' 1-1 draw at Southampton on December 28.
Mourinho claimed there was a "clear campaign" by "people, pundits, commentators and coaches from other teams" against Chelsea and labelled Cesc Fabregas' booking for diving at St Mary's a "scandal".
Those comments means the Blues boss is facing possible disciplinary action and led him to withdraw from routine press activity before and after last weekend's match against Newcastle.
"Now I am in conditions to control myself and one week ago I couldn't," Mourinho explained upon resuming his press responsibilities ahead of Saturday's trip to Swansea.
"It would have put myself under bigger problems, so now I can smile and control my words."
Mourinho has appealed the charge handed down to him by the FA, but is not hopeful, or he says interested, about its success.
The Chelsea boss was, though, keen to stress that he has no issues with Premier League officials.
"We're not against the referees," he said. "We understand the job is not an easy one.
"I am happy to admit my mistakes, so when I spoke with Kevin Friend (after the FA Cup game against Watford) and realised that it was my mistake and not his mistake, I was more than happy to apologise, so there are no problems.
"But the reality is that every decision is going against us and the results were affected by that.
"But far from us - very far from us - to put any doubt about the honesty of the people."
Mourinho insists that, despite his recent comments, he believes refereeing in England is as good as anywhere else he has managed.
He did, though, suggest that what is not good is "the reactions and the influence that you can have on their stability to ref this team or that team".
Asked what could be done to improve that, Mourinho said: "To be fair with everybody and look to everybody with the same eyes and don't put pressure on the referees about their decisions.
"They must feel free, they must feel like the players. The players to express themselves they must feel free, happy, no pressure, best stability to play football.
"With them it has to be exactly the same thing. They have to enjoy the matches and doesn't matter which match and doesn't matter which opponent. It is also important for them."
Refereeing issues dominated the press conference previewing the Swansea match, with Mourinho asked about a report that he told referee Phil Dowd "you're too fat to referee, you should retire" after the New Year's Day defeat at Tottenham - a story he did not deny.
"I go to the referee's dressing room before the game and after the game," Mourinho said.
"When I go before, I go with both captains and with the opposite manager - sometimes the assistant. What we say there is between us and stays there.
"After the match we can go 30 minutes after and sometimes we go and the words are the normal ones, like 'well done', 'good luck for the next one', 'have a good rest' and so on.
"Other times, we discuss like men and like normal people about what happened in the game.
"When I go in that perspective, I have a big advantage, which is I already watch on TV which the referee didn't.
"Many, many times, when I go I know what I am saying and they are surprised with that, you know?
"For example, after Southampton I told Anthony Taylor 'I just watched on TV you made a big mistake'.
"He was sad about the mistake he did and he believed me. He told me 'Jose, I didn't see on TV, so you are right'. Yes, I am right."