Manchester United were left to rue missed opportunities as they were held to a 1-1 draw by Real Sociedad in the first leg of their last-16 Europa League tie.
Ruben Amorim's side started on the front foot against a sluggish LaLiga side and got their reward in the second half when Joshua Zirkzee converted Alejandro Garnacho's right-wing cross.
The issue for United was that they did not go on and build on their dominance and that kept the door ajar for Real Sociedad.
The Basque side took their chance in fortunate circumstances when VAR intervened to award them a penalty after Bruno Fernandes was adjudged to have handled in the box.