However, Di Matteo believes that anyone can win when the match is a one-off.
"We respect his opinion and we'll see on Sunday," the Italian told reporters. "Obviously, I don't agree with him.
"When you play a one-off game, it's difficult to say who's the favourite because of the form the team's in. The dynamic of the game is different.
"This is a decisive game. We are in good form. We've been getting some good results and the players are confident."
The two sides played out a goalless draw at Stamford Bridge at the end of March.