Chelsea boss Jose Mourinho hailed Cesc Fabregas' performance in victory at Burnley.
Chelsea fell behind on Monday night but Costa equalised before man of the match Fabregas set up goals for Andre Schurrle and Branislav Ivanovic.
Mourinho said: "I agree with Cesc being man of the match. He controlled the game and chose how to play."
Burnley manager Sean Dyche was not disheartened with his team's display.
He said: "It is a steep learning curve and tonight we have started at the top."
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