10. William Gallas
William Gallas was one of the best defenders in the world during his time, and was the best sweeper of the modern era. You don’t see players nowadays who can take up the role of Gallas. Being equally competent in attacking and defending, he would slowly join the attack when Chelsea would have the possession of the ball. However, he would have a scar on his reputation as a legend, because he would subsequently join their local rivals Arsenal. But keeping that point aside, it will be safe to say that Chelsea fans were appreciative of the job he has done for Chelsea.