The draw for the Champions League this season was held in Monaco on Thursday.
Real Madrid, who were in the top seeded group in the draw, won the league last year after defeating Atletico Madrid 4-1 in May's final. No team has won repeat European championships since AC Milan in 1989 and 1990.
Group play begins in mid-September and continues through December, when the top two teams from each group advance to the knockout phase.
Group A: Atlético Madrid, Juventus, Olympiacos, Malmö
Group B: Real Madrid, Basel, Liverpool, Ludogorets
Group C: Benfica, Zenit, Bayer Leverkusen, Monaco
Group D: Arsenal, Borussia Dortmund, Galatasaray, Anderlecht
Group E: Bayern Munich, Manchester City, CSKA Moscow, Roma
Group F: Barcelona, Paris Saint-Germain, Ajax, APOEL
Group G: Chelsea, Schalke 04, Sporting Lisbon, Maribor
Group H: FC Porto, Shakhtar Donetsk, Athletic Bilbao, BATE Borisov
- Sarah Barshop