Chelsea manager Jose Mourinho has jumped to the defence of Diego Costa after the striker was booked for diving during the Blues' opening Premier League clash against Burnley last night.

The Spain international found the back of the net in Chelsea's 3-1 victory at Turf Moor, but was also cautioned by referee Michael Oliver.

The 25-year-old was booked for a dive in the first half after appearing to be brought down by Burnley goalkeeper Tom Heaton in the box.

"It was a penalty," the Daily Mail quotes Mourinho as saying. "The linesman made a mistake. We have all explained to [Costa] what we want and what people in the Premier League like and don't like.

"We want it calm with fantastic attitude, competitive but clean and polite. The kid was obviously frustrated to be booked and I hope he doesn't get any more unfair decisions."

Chelsea's next game is against last season's Championship winners Leicester City at Stamford Bridge this Saturday.