The Ivorian international was hurt in last Sunday's 1-0 Premiership victory against Liverpool FC, and manager Joé Mourinho was originally hopeful he could return inside two or three weeks. However, club doctors have conceded that Drogba, who has scored three goals in two Champions League games this season, will be sidelined for at least a month, possibly longer.
'Four or five weeks'
"The medical department found the best way to solve [the injury] will be with a little surgery, but we think in four or five weeks he can be back," Mourinho told Chelsea's website. The 26-year-old will therefore be unavailable for the home match against CSKA on 20 October and the return in Russia on 2 November.
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