In the play-off round of the Europa League, Manchester United will face Barcelona.
The eight teams that finished third in their Champions League groups will face the eight runners-up from their Europa League groups, including United.
On February 16 are the first legs, and on February 23 are the second legs.
Arsenal qualified for the last 16 as one of the winners when they won their Europa League group.
Full play-off round draw
Barcelona v Manchester United
Juventus v Nantes
Sporting Lisbon v Midtjylland
Shakhtar Donetsk v Rennes
Ajax v Union Berlin
Bayer Leverkusen v Monaco
Sevilla v PSV Eindhoven
FC Salzburg v Roma
More to follow.