Milan and Barcelona will clash again in the Champions League group stage while Juventus will face Real Madrid.
The draws were made this evening.
Milan were drawn in Group H with Barcelona, Ajax and Celtic.
Manchester United are in Group A with Shakhtar Donetsk, Leverkusen and Real Socieded.
Juventus are in Group B with Real Madrid, Galatasaray and Copenhagen.
Chelsea are in Group E with Schalke, Basle and Steaua.
Arsenal are in Group F with Marseille, Borussia Dortmund and Napoli.
Manchester City are in Group D with Bayern Munich, CSKA Moscow and Viktoria Plzen.
Group C is composed of Benfica, PSG, Olympiacos and Anderlecht.
Group G is formed of Porto, Atletico, Zenit and Austria Vienna.