Holders Manchester City will play Copenhagen in the last 16 of the Champions League, while Arsenal face Porto.
Copenhagen, who finished above Manchester United in the group stage, reached the knockout stage for the first time since 2011.
Porto are two-time winners, while Arsenal have never won the competition.
The first legs take place on 13-14 or 20-21 February and the second on 5-6 or 12-13 March.
More to follow.