Chelsea's season just goes from bad to worse. The defending champions continued their awful run of form with a defeat against high-flying Leicester City.
Goals from Jamie Vardy and Riyad Mahrez gave the Foxes a deserved 2-1 win at the King Power stadium as Claudio Ranieri picked up three points against his former club.
Vardy put Leicester 1-0 up with a sumptuous volleyed finished and Costa, clearly unhappy with his side's defending, accused some of his teammates of sleeping.
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In an exchange with Nemanja Matic and the Chelsea defence, Costa made a sleeping gesture that perfectly summed up his opinion on the opening goal.
And while some people may have agreed with the forward, Jamie Carragher had a very different view.
Speaking on Sky Sports' Monday Night Football. The former defender said: "There's nothing worse than a player going back and telling other people what they should be doing, considering he's been asleep all season."
Strong, but fair words from the Liverpool legend and his point was evident in the second half as Costa missed the perfect opportunity to drag Chelsea back into the tie when one-on-one with Kasper Schmeichel.
Quite what this result means for Chelsea is unclear, but the club's faith in Jose Mourinho must be waning.
No matter what the Portuguese manager achieved last season, the west London club have gone from title winners to potential relegation battlers. Something has to change.
What is needed at Chelsea: A new manager or new players? Let us know what you think by leaving a comment below