Hiddink said: “I cannot guarantee anything from the players. But he has behaved very well for me and I’m very proud of him and the way he’s playing, and what he did.
“He’s not going over the edge, but he likes to fight in the real way of the game, and that’s what we like.
“I protect him and support him when he’s doing what he’s done in my period at Chelsea.”
Defender Gary Cahill added: “Everyone knows Diego doesn’t need any more motivation. He’s motivated, he’s a winner.”
With Chelsea so far behind the top four in the Premier League, tomorrow night could be their last Champions League game for some time.
Cahill said: “We do realise this is an important game, a big game, and I think you should enjoy that. Top players enjoy playing in big games.”
John Terry, who will miss the game with a hamstring injury, added: “It hurts as a player not to be involved. I have thrown everything at my injury. I hope to be back soon.”