Chelsea boss Carlo Ancelotti has wrote-off Liverpool as a title threat, for now.
Carletto reckons Manchester United and Arsenal are Blues' only serious rivals for the Premier League crown.
He said: "We can't think about Liverpool at this moment because they are behind.
"The title is not just between Chelsea and United. No, I think Arsenal have good possibilities to arrive in first place. Arsenal have a very good team.
"But we must concentrate on United. It's an important game. We will play the second team in the Premier League but it's just a game that carries three points like the others.
"We know very well that it will be a very difficult match but also a very interesting match.
"I think we are doing very well at this moment, we are in good condition. We have a very good mental attitude at this moment."