I still think United are pretty big underdogs in this tie, but Cavani and Neymar missing for PSG are big factors in United's favour. This is by far the biggest test for OGS so far in his tenure, any kind of lead to take to Paris will be a bonus.
PSG have plenty of other players to cause United problems even taking their two absentees into account and United's defensive frailties will be under great scutiny tonight. DDG will need to be on his game - he usually is - and who partners Lindelof will have a big bearing on the outcome if United are under a lot of pressure tonight. Jones will probably get the vote, I'd rather see Smalling in there but who knows, Bailly might be the one who gets the nod.
United might well lose this tie, but if they do, at least they will have gone out and given it a go over the two games and not tried to stifle the life out of the opposition and having played the way we saw in the pathetic manner in the Sevilla home tie and more recently the thoroughly tepid and depressing performances in the City and Liverpool games.
As it is, circumstances mean there is a degree of optimism and that's a good thing and a sign of the way OGS has gone about his job.