Chelsea currently trail leaders Manchester United by nine points and after a bright start to the campaign are currently in their worst run of form for 15 years, with just one win in their last nine league games.
For Blues skipper John Terry it's a long way from August when his team topped the league and were scoring goals for fun.
The England defender admits Chelsea's chances of defending their crown come May are looking unlikely.
"Our recent performances have not been good enough, we're not playing at the level we can and we're slipping further behind the leaders with every point we drop," he is quoted by the Daily Star.
"That's unacceptable for a club like this, where we expect to win every game, and now we have to start to put things right.
"This squad should be challenging at the top of the league, winning games and pushing hard in every competition.
"That remains our aim, even if we have gone off course recently. But, before we start thinking about silverware, we have to concentrate on starting to win games again."