Chelsea boss Jose Mourinho was left disappointed with their collapse at Newcastle United yesterday.
The Blues dominated for long periods at St James' Park, but were unable to make the pressure tell, and the Magpies took full advantage with second-half goals from Yoan Gouffran and Loic Remy securing a priceless 2-0 victory.
Mourinho said: "Of course, of course I am worried, and I read in previous years, it happened the same.
"They (Chelsea) were successful in cup competitions, they were not successful in the Premier League. They finished 20 points behind, they finished 15 points behind.
"They qualified for the Champions League because they won the Champions League, but they finished fifth or sixth in the league.
"Last year in December, they were not in the race for the title because they were already 20 points behind. This season, we have played five matches away in the Premier League - I know at difficult places to play difficult matches - but we have one victory and we have two defeats.
"Of course it concerns me."
