Chelsea manager Antonio Conte says he doesn’t understand those who criticise Costa for his behaviour on field.
The Spain international has been booked in both matches of the season so fat, with many thinking he should get red for later offences.
“I don’t understand that other players or managers or press all say bad (things) about him,” he told reporters.
“Diego must be focused on the match. Because for me, the most important thing is the match – it’s important to pay attention, because he is an important player and he can score a lot of goals and I want him to put himself in the game and not to think of other situations.
“Because it’s not good for him, for me, for Chelsea or the fans. I think for the English league, this is no good.
“Have I spoken to him about it? Yes, I try to speak to all my players – all together and individually and its important to have these relations. But when I speak to them, I keep it between ourselves.”