Reigning European champions Bayern Munich face a second round clash with English Premier League leaders Arsenal in the pick of the eight matches in the second round of the Champions League.
In another mouth-watering tie, free-scoring Manchester City take on Barcelona.
First-leg matches will be played on February 18, 19, 25 and 26 with the deciding return legs held on March 11, 12, 18 and 19.
Manchester City (ENG) – Barcelona (SPA)
Olympiacos (GRE) – Manchester United (ENG)
AC Milan (ITA) – Atletico Madrid (SPA)
Bayer Leverkusen (GER) – Paris Saint Germain (FRA)
Galatasaray (TUR) – Chelsea (ENG)
Schalke 04 (GER) – Real Madrid (SPA)
Zenit St. Petersburg (RUS) – Borussia Dortmund (GER)
Arsenal (ENG)- Bayern Munich (GER)