Manchester United may have to lock horns with Barcelona or Juventus as they need to overcome a two-legged play-off to reach the last-16 of the Europa League.
Alejandro Garnacho's goal, securing a 1-0 win over Real Sociedad, was not enough for United to top their group and as a result they will face one of the eight teams demoted from the Champions League in a dreaded play-off.
There are no such concerns for Premier League leaders Arsenal after they beat FC Zurich on Thursday, sailing straight through to the last-16, but United now face an anxious wait to find out their opponent.