Let's look at the odds:
•
Manchester United : 2.02
•
Draw : 3.30
•
Real Sociedad : 4.10
These are for regular time by the way. As for "to qualify", the home side is given 1.52 odds while the away one is given 2.48. Which one would you choose here?
As for my opinion, I'd choose Manchester United to qualify instead of betting on them plainly. It is if I'm not looking for an unusual bet. Otherwise Real Sociedad can also be given a chance but I don't trust them more than Amorim's club honestly.

Two days ago the odds were like this:
Bookmakers are currently quoting this game as follows:
1.86 - 3.35 - 4.80
I have noticed that if bookmakers move the line, it is a bad sign for the team they are doing it against. Maybe we are looking at different bookmakers but the difference is obvious. United are the favourites but now the odds of 2+ are becoming suspiciously generous. I don't know what's going on, maybe I won't be able to resist and will place a live bet.