Arsenal have destroyed PSV in Philips Stadion, I don't think it's gonna be a hard match against Manchester United. Manchester United not even able to beat Real Sociedad. Arsenal lost several important players, but don't forget Manchester United almost lost half of their players.
Because Arsenal were able to humiliate PSV in the first leg of champions league doesn’t mean they will be able to win Manchester United, you shouldn’t use Arsenal performance in their last match to judge how they will play against Manchester United in their next match. I know Arsenal might be able to get a win in the match, but it’s not going to be easy the way people are thinking Arsenal will win the match easy. I know Manchester United are performing poorly, but any top club playing against them currently will have to be careful, because they might end up surprising us.
The match is going to be a interesting one, how I wish Manchester United will be able to surprise us in the match, I really want Manchester United to get a draw in the match, or they should get a win. Arteta shouldn’t just underestimate Manchester United in the match, because he might be disappointed if he does.