Chelsea ace Eden Hazard says Diego Costa has changed his mentality to fire them to the top of the table.
Chelsea went a goal down against Manchester City at Etihad Stadium thanks to an own goal from Gary Cahill, but Costa struck a clinical equaliser before Willian and Hazard completed the comeback for a 3-1 victory to keep Antonio Conte's team top of the table.
Hazard told his club's official website: "Before [Costa] was scoring a lot but sometimes getting yellow cards or red cards, now he's not, that's the big change.
"He gives everything on the pitch, he scored a goal and got one assist, he's been on fire since the start of the season."