Cristiano Ronaldo and Lionel Messi will face off in the Champions League group stage for the first time as Juventus and Barcelona were drawn together in Group G.
Holders Bayern Munich will face Atletico Madrid, while Manchester United were drawn in the same group as Paris Saint-Germain and RB Leipzig, who met in last season's semifinals.
Liverpool were placed in a group which promises goals alongside Ajax and Atalanta as well as newcomers FC Midtjylland, while Real Madrid and Inter Milan were also paired together in Group B.