In the past week alone, Mourinho has claimed Premier League games are now being played to 'new rules', stating Chelsea were denied a clear penalty at Newcastle on Sunday, while United had not conceded two against Sheffield United and Middlesbrough.

Although Mourinho did not accuse any individuals, or outline who he felt was responsible for the 'rule change', it left Ferguson feeling the Blues manager was questioning the integrity of the English game.

Then, to further fan the flames, Mourinho labelled fellow countryman Cristiano Ronaldo 'a liar' after the Portugal winger launched his own counter-attack, claiming the former Porto chief cannot accept failure.

Now Ferguson has entered the debate, leaving Mourinho in no doubt he does not think much of his present behaviour.

"Jose Mourinho seems to be on some sort of personal crusade about regulations," observed the Scot.

"I am surprised no action has been taken against him. He just seems to go on, and on, and on. Everybody gets bad decisions, you just have to get on with it.

"He is saying our game is suspicious. That is wrong.

"He abused Barcelona in the past, a Swedish referee (Anders Frisk), a German referee (Markus Merk) and the other night he said Liverpool players were going to hunt down Didier Drogba to get him booked. That is very disappointing.

"As for Cristiano Ronaldo, everyone is entitled to have a comment or opinion. That doesn't mean to say they are liars.

"He is on about changing regulations. Who is doing it? The FA? The Premier League? UEFA?"