Chelsea goalkeeper Petr Cech admits the Blues are failing to keep their concentration levels in games as the inquest over their mid-season slump continues.
Carlo Ancelotti's side have won just one league game out of the last six and Saturday's 1-1 home draw with Everton was another example of Chelsea failing to focus for a full 90 minutes.
"We're in a period where everything is going against us and the small, little things make a difference," said Cech. "Unfortunately the Everton one is painful because in the first-half we played very well.
"We controlled the game, we scored the goal, hit the crossbar, and then in the second half out of nothing, we stopped playing and they had chances, more possession and were dangerous.
"It is an unusual situation for everybody, the last five or six games are not what we are used to or would expect. But sometimes you have periods in sport, especially in football, when things go this way.
"When you are going through a difficult period you have it on your mind that you have to defend better, but sometimes it's not the way it should be."