Seven-times champions AC Milan, knocked out of the Champions League by Barcelona in the last two seasons, were drawn against the Catalans again in the group stage of this season's competition on Thursday.
AC Milan were beaten 4-2 on aggregate by Barcelona in the round of 16 last year and 3-1 on aggregate in the quarterfinals two seasons ago, when the two sides also met in the group stage.
The teams were drawn in Group H, alongside four-times winners Ajax Amsterdam and Celtic, the Scottish champions having also faced Barcelona in the group stage last season.
Nine-times champions Real Madrid will meet Juventus in two mouth-watering clashes in Group B which also features Galatasaray and FC Copenhagen.
Defending champions Bayern Munich will face CSKA Moscow, Manchester City and Viktoria Plzen in Group D.
Groups: Group A: Manchester United (Eng), Shakhtar Donetsk (Ukr), Bater Leverkusen (Ger), Real Sociedad (Spa); Group B: Real Madrid (Spa), Juventus (Ita), Galatasaray (Tur), FC Copenhagen (Den); Group C: Benfica (Por), Paris St Germain (Fra), Olympiakos Piraeus (Gre), Anderlecht (Bel);
Group D: Bayern Munich (Ger), CSKA Moscow (Rus), Manchester City (Eng), Viktoria Plzen (Cze); Group E: Chelsea (Eng), Schalke 04 (Ger), Basel (Sui), Steaua Bucharest (Rom); Group F: Arsenal (Eng), Olympique Marseille (Fra), Borussia Dortmund (Ger), Napoli (Ita); Group G: Porto (Por), Atletico Madrid (Spa), Zenit St Petersburg (Rus), Austria Vienna (Aut); Group H: Barcelona (Spa), AC Milan (Ita), Ajax Amsterdam (Ned), Celtic (Sco).
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