Chelsea striker Didier Drogba has admitted his availability for Tuesday´s Champions League opener with Rosenborg remains in doubt.

The Ivory Coast forward was forced to sit out Saturday´s 0-0 draw with Blackburn after failing to shake off a problem in his right knee he has been carrying since pre-season.

"For a month I´ve trained with pain in my right knee," wrote Drogba in his column for French magazine Sport. Sadly, I´ve not been able to get rid of this discomfort. I´ve played four Premier League matches in this state and it is unbearable."

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