Chelsea look set to be without Michael Essien for the rest of the year after it was confirmed the midfielder would need surgery on a knee injury
The 25-year-old suffered the problem while on international duty with Ghana.
A club statement read: "Michael has ruptured his anterior cruciate ligament and will undergo an operation as soon as the majority of the swelling has subsided. We expect this to happen in a week's time.
"In the meantime, Michael has started rehab in the aqua therapy centre at Cobham which will improve the condition of the knee prior to surgery. A return to full fitness is not expected for several months."