Chelsea's star striker Didier Drogba has warned that his side cannot use the excuse of injuries to key players as a reason for their recent slump in form.
The Blues have lost the leadership of the Premier League to Manchester United after losing three and drawing one of their last five league games, with the likes of John Terry, Frank Lampard and Michael Essien all sidelined.
However, Drogba told reporters: "It is maybe the worst run of form I've known since I came to the club. It is not good.
"It is very frustrating - very frustrating. I know that during the season you can have moments like this and try your best to change it.
"We are playing those teams around us in the next few weeks, so this is a challenge that we have to do everything to win.
"We can't use the players who are out as an excuse, even if they are key players. When you sign for Chelsea, you know you have to give your best.
"You know you've signed for the best team, so you have to improve your game, especially when players like Terry, Lampard and Essien are not there.
"This is the moment when you have to show you are able to take responsibility, because you know it won't be easy.
"We have to change it as players, with the manager, all of us together. We have to stay together as a team."