Jose Mourinho admits he is concerned about Chelsea's Premier League form following their 2-0 defeat against Newcastle today.
Goals from Yoan Gouffran and Loic Remy were enough to consign the Blues to their second Premier League defeat of the season.
The loss means Chelsea passed up the opportunity to make up ground on title rivals Arsenal and Liverpool, who face each other this evening.
However of greater concern for Mourinho is the possibility that his side are good enough to win knockout competitions as they have done in recent seasons, but may not have the consistency to go all the way in the Premier League.
Asked whether he anticipated a reaction from his players in their Champions League tie against Schalke in mid-week, the Chelsea boss said: "I don't know what reaction to expect. First of all I have to understand why we had this performance. The reaction is something that comes after this match.
"I am worried. I saw the previous years and the same thing happened. The team was successful in cup competitions and they were not successful in the Premier League. They finished 15 points, 20 points behind the league leaders.
Mourinho added that his side's form away from Stamford Bridge is also cause for concern.
"This season we have played five matches away in the league - I know difficult places, difficult matches - but we have one victory and we have two defeats. It does concern me.'"
The 'Special One' made sweeping changes to the side that won so convincingly in the Capital One cup against Arsenal last week for the game against Newcastle.
On reflection, Mourinho feels he may have made a mistake in rotating his first XI so much.
"I made 11 mistakes," he said. "I should pick the other 11 and not this one, and it's the feeling I have when my team plays so bad. Of course I'm exaggerating because I had some players in good form but the feeling is that I made 11 wrong choices."