Michael Ballack says Chelsea's trip to Liverpool on Sunday is a must-win game.

Ballack said: "We know it's difficult to win at Anfield but it's not impossible.

"If we want to go back to the top, we have to win but Wednesday is the immediate focus.

"We have dropped too many points at home and we have to be careful.

"We've not had good performance this year against the big teams. That has to change if we are to win the title."