Chelsea boss Jose Mourinho says he is "angry" and "worried" following their defeat by Newcastle at St James' Park.
Yoan Gouffran and Loic Remy both scored as the below-par Blues suffered their second defeat of the season.
"I'm angry because I don't understand [why we lost]," said manager Mourinho.
"I was expecting to lose my next game when the opponent was fantastic or when we were very unlucky - a match where we fought to our limits and couldn't get the result."
The Magpies' victory means Chelsea have taken just five points from as many games on the road this season, but 15 out of 15 at Stamford Bridge.
The visitors shaded the first half as John Terry hit the bar and had a header cleared off the line, but they were overpowered in the second period as Newcastle seized control.
Despite victory in their previous six matches, Mourinho, in his second spell in charge of the club, admits he is worried about his team's form on the road.
"Of course I am worried, and I read in previous years it happened the same," the Portuguese said.
"[Chelsea] were successful in cup competitions but not successful in the Premier League.
"They qualified for the Champions League because they won the Champions League, but they finished fifth or sixth in the league.
Away day Blues
Chelsea's five points from their opening five away matches this season is their worst such return since three from their opening five in 2000-01.
"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."
Mourinho made nine changes to his team following Tuesday's
Capital One Cup victory over Arsenal,
and he suggested he might have got some, possibly all, of his selections wrong.
"I made 11 mistakes, 11 mistakes. I should have picked another 11 and not this one," he said.
"It's the feeling I have. When my team plays so badly, it's the feeling I have.
"I'm exaggerating. Of course we had some guys with, I am not saying outstanding, but with some normal good performances, but the feeling is that I made 11 wrong choices."
There were no such worries for Alan Pardew, after the Magpies boss watched his side recover from last weekend's defeat by local rivals Sunderland.
Chelsea's next five matches
Chelsea v Schalke
Chelsea v West Brom
West Ham v Chelsea
Basel v Chelsea
Chelsea v Southampton
However, the Newcastle manager preferred to let his players take the credit - despite his conversation with Yohan Cabaye leading to the Frenchman delivering a superb free-kick to the far post for Gouffran to open the scoring.
"I just asked him to hit it on the back of their back four with shape and a bit of pace because we weren't really getting any joy from balls going into their box," said Pardew.
"He went for glory, really, but he executed it on the money and I am not going to try to take any credit for that.
"You have to be a top, top player to hit that ball in, and Gouff connected brilliantly and gave us a platform then.
"I wouldn't say we were brilliant in the first half, but in the second half, we were very good."