He said: "With [Andre] Villas-Boas, they tried to have the ball a lot more - not play so many balls long and not seek out the second ball quite so much.
"They've gone back to the type of Chelsea that was more successful a few years ago with Di Matteo - playing on the counter, trying to hit the target man, sitting back and using that number 9 as a reference point.
"They are a very, very dangerous team. They are like motorbikes now - faster, quicker to get the ball forward. Get after it and cause problems."
Fabregas has scored 13 goals in 37 appearances since moving to the Nou Camp in a £30m deal in August.