Chelsea boss Jose Mourinho won't be underestimating today's opponents Aston Villa.

Aston Villa handed Chelsea a major setback to their title hopes last term with a 1-0 win at Villa Park in March and arrive full of confidence as they sit second in the table.

"They are a difficult opponent and it will be a difficult match because of the qualities they have as a team," Mourinho said.

"They are second, they have 10 points and that's the important thing. It's a game between the leader and second position. It shows the difficulty of the game. We have to improve in every aspect."