Chelsea manager Jose Mourinho says defeat at Crystal Palace has ruined his side's bid for the Premier League title.
John Terry's second half own goal was enough for The Eagles to ease their relegation fears with a first win over the Blues since 1990.
And with defeat having breathed new life into Arsenal, Liverpool and Manchester City's pursuit of the title, the Chelsea boss has conceded his team will not sit on the Premier League summit come the end of the season.
"Now we have lost our chance of finishing first," said Mourinho. "Now we depend too much on other results.
"Crystal Palace deserved the victory, they fought for their lives. We had good chances and their goalkeeper made some good saves in the first half. But their spirit was stronger, their desire was stronger and their commitment was stronger. That disappoints me, but it's a defeat that we can only blame ourselves for.
"Some of our players are not comfortable in these types of matches, like Stoke away, Newcastle away and Everton away. Can I change this? I don't know. My defenders are phenomenal, but in other positions we have players that can be in trouble."
City could reclaim top spot should they beat Arsenal at the Emirates Stadium and Manuel Pellegrini's side have two extras games in hand over Chelsea in order to cement their status as title favourites.
If City fail to take advantage Arsenal could go within three points after their 6-0 defeat to Chelsea last weekend while Liverpool could go top should they beat Tottenham Hotspur on Sunday.
Chelsea face Paris Saint Germain in the Champions League last eight first leg on Wednesday and defender Gary Cahill said: "Crystal Palace worked hard and they made it difficult for us. They played a lot of long balls and direct football and we're disappointed with the result.
"We have got to keep going but it feels like the end, that it is over. It is massively disappointing and at the end of the game it was a horrible feeling. We have to bounce back, we have only got a few days before we go to Paris."