Chelsea aren't as good as in their Mourinho days - Sir Alex Ferguson

The Manchester United manager believes that his side can make the Blues suffer their first Premier League defeat this season after lashing out at their declining quality

Sir Alex Ferguson believes that his side have a chance against Chelsea if they can contain the Blues' attack, as Manchester United travel to Stamford Bridge in an early but potentially season-shaping match.

Roberto Di Matteo's men are currently four points ahead of their visitors and one point clear of Manchester City, meaning that a win for the London club would put them clear at the top of the Premier League.

However, despite the current leaders being undefeated so far in the league, the United boss feels that he has seen better Blues teams than this.

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Sir Alex told reporters: "I wouldn't say this is the strongest Chelsea team. I think if you go back to [Jose] Mourinho's, they were ­formidable and really difficult to play against.

"That period of Didier Drogba, a younger John Terry and Frank Lampard, who one year got 30 goals from midfield – they'll never get that again. They were a really powerful team, hard to beat – and ruthless."

Terry will have to watch the action from the sidelines whilst serving the second game of his four-match ban, while Lampard has been ruled out of the game due to an injury he picked up in the Champions League group-stage match in midweek.

Even though United will not face the "ruthless" Terry and Lampard, Sir Alex is wary of the attacking threats at Di Matteo's disposal.

The 70-year-old: “They gained confidence from winning the Champions League but Roberto has shown he's bold and you've got to give the lad credit. It's very positive.

"I thought it was a risk to have those three players [Juan Mata, Oscar and Eden Hazard] in the same team. Attacking-wise he's got great options - but, if you can contain them, you have a chance."