Drogba scored 33 goals for Chelsea last season and was the club’s leading scorer.
He said: “It has been agony since as far back as Chelsea’s last pre-season match.
“During that time I’ve played four Premier League matches – I just can’t go on like that any more. I’m desperately hoping to be free from pain by the time we play Valencia on October 3.
“But, frankly, I’m truly p***** off at the idea of missing even one Champions League match.
“That’s the competition I MUST win this season.”
