Chelsea's concerns are at the top of the table and they have played more games than rivals Manchester City and Liverpool.
A second successive away loss saw Jose Mourinho admit his hopes of a third Premier League title are over with six matches to go.
Mourinho said: "We depend too much on other results. When you depend a little it's possible, when you depend a lot, I don't think it's possible.
"We depend now too much. I don't think now we can win the league."