Roberto Di Matteo’s side have set an ominous pace at the top of the league but Ferguson contends they cannot match the “ruthlessness” of the Mourinho-led Chelsea that won the title in 2005 and 2006, forcing the Scot to raise his own game at Old Trafford.
Ferguson declared: “I wouldn’t say this is the strongest Chelsea team. I think if you go back to 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.”