He said: "The playing philosophy introduced here a couple of years ago was very different to Barcelona.
"But it does not mean Barca is a better team than Chelsea, it's just a different way of approaching the game.
"You have to be realistic. We have fantastic players, but for a certain way of playing football you need a certain type of player - and we just don't have them."
He said: "It is more relaxed here because we have a more experience.