Since Roman Abramovich bought the club in 2003, Chelsea have seen their fair share of players come and leave the club. Among them, legends have been born and history written, but as is natural with so much money, there have also been a number of very high profile transfer flops.
What follows is a list of five of the best and worst purchases in the Roman Abramovich era.
When choosing who must go on the list, it was much harder to pick the best five than the worst five. Although the biggest transfer failures have been well-publicized, there have been far more successes. So many in fact, that some notable omissions include Joe Cole, Arjen Robben, Michael Essien, Michael Ballack, Branislav Ivanovic and Eden Hazard.
The reason for this is that the top five have been chosen with special consideration for value for money, impact on the club and length of stay. Ivanovic and Hazard have not been included because they are still at the beginning of their Chelsea careers, and have much more history to make.
As for the flops, the same sort of considerations were made, especially money. You may notice that a certain Fernando Torres is absent from either list—and that is because the jury is still out on the Spaniard. Also absent are some players such as Yuri Zhirkov, who, although he did not stay long, left for a respectable fee.
So without further ado, here are the best and worst of Chelsea's transfers from the last ten years.