Rangers were faster and couldn't win because of that. Mourinho likes his teams to have a good defense, but Fenerbahce doesn't have that, he hasn't been able to achieve that yet, maybe he didn't have enough time for that, or maybe he wants to change something. I know that Mourinho had high hopes for the Europa League, now it looks like Fenerbahce has no chance to fix anything in the return match, since the two-goal difference will be very difficult to make up.
In fact, Fenerbahçe has made some good additions to their squad recently. I mean to the defense line. But they have been facing a serious injury issue in this area unfortunately.

There is still a solid defender like Skriniar but this isn't enough. Maybe Mourinho needs to make some changes in his understanding of defense as of now. He must have seen the biggest weaknesses in the first leg.
Do I think they can make a comeback? Hmm... I'm not very positive but I would love to see it of course.

They will need to take big risks to do that now.