Chelsea chairman Bruce Buck has revealed they're leaning on manager Guus Hiddink over plans for the summer market.

"We are going to solicit his [Hiddink's] views as we think about summer transfers," Buck told Chelsea TV before going on to discuss transfer policy in the past few seasons - and what are perceived in some quarters to have been some expensive errors.

"I don't think we make any more mistakes than any other club," he argued. "We did look at this over a five-year period.

"This is not a perfect science. There is a lot of subjectivity that goes into buying a player and sometimes it doesn't work out as well as you would have expected. Sometimes it works out very well. I give us credit for expensive players like Drogba and Essien when they work out.

"In the summer time, you don't have a crystal ball. You know what your squad is, you have a view on replacements and you do the best you can. You can't predict that this person is going to be injured in November or this person just isn't going to have it in January."