Chelsea will face Valencia, the former club of latest new signing Juan Mata, plus Bayer Leverkusen - where Michael Ballack is now playing - and Genk from Belgium in Group E.
Chelsea communications director Steve Atkins said: "Every draw throws up challenges and this is no different, and I have spoken to Andre [Villas-Boas] and he certainly feels that too.
"Valencia is a formidable team and a very difficult place to go with their support - Juan Mata will be returning there a little bit more quickly than he thought!
"Bayer Leverkusen is also a difficult one and we will be delighted to meet up with Michael Ballack again, and Genk too are full of talent and should not be underestimated."
Champions League Group Stage
|Group A||Group B||Group C||Group D|
|Bayern Munich||Trabzonspor||Manchester United||Olympique Lyonnais|
|Manchester City||LOSC Lille||FC Basle||Dinamo Zagreb|
|SSC Napoli||CSKA Moscow||Otelul Galati||Real Madrid|
|Group E||Group F||Group G||Group H|
|Valencia||Arsenal||Zenit St. petersburg||BATE Borisov|
|Bayer Leverkusen||Olympique Marseille||Shakhtar Donetsk||AC Milan|
|Racing Genk||Borussia Dortmund||APOEL||Viktoria Plzen|