Interim Chelsea manager Guus Hiddink told Diego Costa not to change his aggressive style, saying he preferred his striker to be passionate.
Spain international Costa is certain to be at the centre of the action again when Chelsea visit rivals Arsenal on Sunday.
"I'd prefer to have players who, sometimes, you have to control or tell them 'a little bit less' than have to push them," he said.
"Sometimes you are misjudged by images. Off the pitch, they seem to be the most vulnerable figures. He shows a lot of joy to everyone.
"I observe the players when they are in the canteen, dealing with people who prepare the pitches, not snobby or arrogant - that's good to see.
"They're different characters off the pitch. On the pitch they have that desperate will to win, almost at any cost. That's a slight change in character and behaviour."
"This club is used to thinking about being top three or four in England," the Dutchman said.
"Winning these games might bring confidence to the club and the team to ask, ‘hey, where do we belong?’ And think about why this team has fallen so deeply in the recent period."
