Thibaut Courtois says Chelsea must beat Manchester United on Sunday to have any chance of retaining the Premier League title.
The Blues are nine points adrift of leaders Manchester City and four behind second-placed United after 10 games, struggling for consistency on their return to Europe.
"This is a must-win game," Courtois said. "Manchester City are already nine points ahead of us, Manchester United four and Tottenham one.
"We must win games like these to remain at the top and close to the other ones. We will try to get the three points and will give our lives for it on Sunday."
Jose Mourinho would surely relish doling out a heavy blow on his former club after Chelsea beat his United side twice at Stamford Bridge last term. Former Blues Nemanja Matic, Romelu Lukaku and Juan Mata will be in opposition when United visit.