Each group will have a club from each pot, with no league being represented twice in one group.
Pot One: Inter Milan, Barcelona, Manchester United, Chelsea, Arsenal, Bayern Munich, AC Milan, Lyon.
Pot Two: Werder Bremen, Real Madrid, Roma, Shakhtar Donetsk, Benfica, Valencia, Marseille, Panathinaikos.
Pot Three: Tottenham Hotspur, Rangers, Ajax, Schalke, Basle, Braga, FC Copenhagen, Spartak Moscow.
Pot Four: Hapoel Tel Aviv, FC Twente, Rubin Kazan, Auxerre, CFR Cluj, Partizan Belgrade, MSK Zilina, Bursaspor.
I'm not exactly the world's expert on minor European teams, but obviously being drawn against the likes of Real Madrid wouldn't be the best news for the Blues. What's everyone's ideal group for Chelsea to end up with? How about the worst case?
We'll find out our fate tomorrow at 5:00 PM BST (9:00 AM PST)