Chelsea boss Guus Hiddink refuses to take credit for Didier Drogba's turnaround in form since his arrival.

Drogba scored twice against Bolton, but also added his height and weight to the defensive efforts before being called to the bench, along with Frank Lampard, after 66 minutes.

"I don't know if it's psychological with him or why it didn't work with him in the past," Hiddink said. "He is very composed and energetic. He has given himself and the team a drive in that position. Of course you can work with them but the players themselves have to do it."