All eyes will be on Costa at Arsenal tomorrow after his antics against them earlier in the season earned him a retrospective three match ban.
But Blues boss Hiddink insists he would rather be with than without his hothead hitman.
Asked if Costa needs to show more restraint sometimes, Hiddink said: "Yes, but I'd prefer to have players who, sometimes, you have to control or tell them 'a little bit less' than have to push them.