Bayern Munich have been drawn in the "most difficult" Champions League group, according to club president Karl Hopfner.
Bayern, who lifted the Champions League in 2013, have been drawn alongside Manchester City, CSKA Moscow and Roma in Group E.
This is the second season in a row that the Bundesliga title holders will face City and CSKA -- Bayern and City progressed to the knockout stages last campaign, with CSKA finishing third.
Champions League group stage
A: Atletico Madrid, Juventus, Olympiakos, Malmo
B: Real Madrid, Basel, Liverpool, Ludogorets
C: Benfica, Zenit, Leverkusen, Monaco
D: Arsenal, Dortmund, Galatasaray, Anderlecht
E: Bayern Munich, CSKA Moscow, Man City, Roma
F: Barcelona, PSG, Ajax, APOEL
G: Chelsea, Schalke, Sporting, Maribor
H: Porto, Shakhtar, Athletic Bilbao, BATE
"This is the most difficult group, I can say that much. But we don't have any fears. We've already played two of the three teams last year." Bayern president Karl Hopfner.
CEO Karl-Heinz Rummenigge said: "A difficult, but interesting group. We need to be focused from the very start to reach the last 16."
Sporting executive Matthias Sammer added: "Usually you'd have one or two weaker opponents during the group stages, that's not the case here.
"It's a highly attractive group, very difficult -- but also just the right challenge for us. We have to be focused from the very beginning, that's good for us."