London: Manchester United Alex Ferguson has fired his first salvo against Chelseas Luiz Felipe Scolari by saying that he will find it impossible to improve on Jose Mourinhos two titles for Chelsea.

He also said that the Chelsea squad is too old to take another step up.

Im not concerned about Chelsea. Mourinho won the title two years in a row and beat us in the FA Cup final. Avram Grant did a good job, but no one can improve on Mourinhos record, The Daily Express quoted Ferguson, as saying.

Scolari got under Fergusons skin last season when he was accused of over-using Cristiano Ronaldo in friendly matches for Portugal. Scolari hit back by wading into the Ronaldo transfer saga.

Scolari is fortunate. He is joining a big club and he is joining a team of internationals, said Ferguson.

But its hard to see where theres going to be a big improvement with a team thats really very experienced. Maybe theyve plateaued, he added.

Ferguson has seen off many managerial rivals in his 22 years at Old Trafford, including Mourinho.

His clashes with Scolari are sure to be a feature of this season the first one comes at Stamford Bridge in September and for now, Ferguson remains dismissive.