Manchester United have been paired in Group C alongside Portuguese outfit Benfica, FC Basel, and will also face Romanian debutants Otelul Galati.
Chelsea's toughest test will come in the form of La Liga side Valencia, having also been paired alongside Bayer Leverkusen and Racing Genk.
Meanwhile, Arsenal, who successfully overcame their first hurdle in last night's play-off encounter face arguably the hardest task in Group F with upcoming fixtures against Marseille, Olympiacos and Borussia Dortmund.
Group Stage Draw at a glance
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