City and Arsenal handed tough draw
Manchester City's Champions League curse returned to haunt them after they were drawn with last season's finalists Juventus and Europa League winners Seville for the group stage.
City, who have suffered tough draws in the last four seasons of the Champions League, were selected in Group D - with the other team being Bundesliga side Borussia Monchengladbach.
Arsenal also face a tough task in Group F against Bayern Munich, who have eliminated the Gunners from the competition in two out of the last three seasons - but have more straightforward opposition from Greek side Olympiakos - who are in the middle of a match-fixing scandal - and Dinamo Zagreb.
Chelsea boss Jose Mourinho will have a return to a former side Porto, whom he took to Champions League glory in 2004, and his side should have little trouble with Dynamo Kiev and Maccabi Tel Aviv.
Manchester United's return and face PSV Eindhoven, CSKA Moscow and German side Wolfsburg.