Real Sociedad have always been a team that often causes problems for the big teams in La Liga, the last defeat to Barcelona was because they played with 10 men from the 17th minute, overall their performance was not as disappointing as Man United. In my opinion, the only big problem that Man United have is playing at Sociedad's home ground, it is very difficult to beat Sociedad when playing at their home ground, so the final result is clear who will win and who will lose.
We already know the the outcome of the game, Real Sociedad will win struggling Manchester united at home and even away in England, there is no way Manchester united is going to survive this game. Their focus is divided already, Manchester united is fighting for relegation zone in the premier league, and they will do everything to remain in the league than risking it for Europa.
The Manchester united is having a lot of set bad luck at the moment ranging from players in injury to poor performances, no good striker in the team no good defenders. the players are all low quantities and not fit for the squad. Real Sociedad is 10 position on the laliga table, with an impressive performance in their previous group stage games. i do not think Manchester united stand a chance to qualify.