Premier League leaders Arsenal, will face Porto in the next round of the Champions league.
Arsenal who topped Group B but have never won the Champion League, beat Porto 5-0 at Emirates Stadium the last time they met in 2010.
Runners-up in Portugal’s Primeira Liga last season, Porto won four of their six Group H games to finish second behind Barcelona.
Manchester City will also meet Denmark club, Copenhagen.
Man City won Group G with a 100% record, while Copenhagen, who lost 1-0 at United before beating them 4-3 at home, were runners-up to Bayern in Group A.