Manchester United face a tough Europa League knockout round play-off tie after failing to build on teenager Alejandro Garnacho's outstanding opener and beat Real Sociedad by a two-goal margin.
Both sides were already assured of progress from Group E ahead of the San Sebastian showdown, but September's shock Old Trafford defeat to the La Liga side meant United travelled to Spain in second spot.
Garnacho's superb goal got the Red Devils off to a dream start as they sought to usurp the hosts, but they struggled in the second half as Sociedad held tight for a 1-0 loss that means they top the group on goal difference.
Erik ten Hag's runners-up will now have to play an extra round in mid-February against a side dropping out of the Champions League, with Barcelona, Juventus and his former club Ajax among the potential opponents.