Chelsea striker Didier Drogba has admitted that his club's recent downward slide in form has been the worst he has witnessed during his six-year time at Stamford Bridge.
Drogba said that Chelsea is starting to feel the pressure after a dismal return of just four points out of a possible 15.
"It is maybe the worst run of form I've known since I came to the club. It is not good," the Sun quoted Drogba, as saying.
"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," he added.
Chelsea has won only one of their last five Premier League games, with three of them being losses.
The 32-year-old further said that the pressure is now starting to get to manager Carlo Ancelotti and rest of his teammates.
"It's a lot to say the manager is under pressure because of the results, yes. But we are not winning and the teams behind us are coming back - and are even in front of us now," Drogba said.
"Losing top spot, it's not nice, obviously - to see that Manchester United are up front and Arsenal as well. But that's the challenge. We have to see it as a challenge more than being disappointed. You know you have to see it as a challenge and do everything to come back," he added.
