I liken Manchester United to Sevilla this season for now. I mean you know what Sevilla did last season. They were horrible in the La Liga most of the time. But on one hand their performance in the Europa League was marvelous after a point. They even won the Europa League title while not doing well in the La Liga.
I don't say that Manchester United will win the Champions League of course.

But despite their poor effort in the Premier League so far their performance in the Champions League against Bayern Munich was really promising. It seems like they can concentrate on that tournament more currently.