Fenerbahce cannot be underestimated, they are quite better in the league, and they are drawn by the same team, who drew with Man United in the previous match.
I mean currently Fenerbahçe aren't playing that good. They have "The Special One" managing the team this season but for now they are struggling in multiple ways. Such as giving huge opportunities to their opponents and not being able to score comfortably. The defensive weaknesses just don't heal yet. Mourinho should find out a way with the current players he has or with transfers maybe.
And as for the offense, Dzeko is really old now. You can't expect him to play extra but he is still doing it. However not in the Europa League.
En-Nesyri is a huge disappointment. He misses chances unbelievably.
I think their defense is not too bad, they conceded 5 goals in the domestic league and conceded 2 goals in the Europa League, that's not a bad record, in fact I think it's quite good. But I don't deny that they still have weaknesses that they need to fix, one of which is their balance when facing clubs that have the same level or better than them, that's a record that they need to fix immediately. However, in this Europa League, everything is not easy, because all clubs try their best to be able to talk a lot, especially for clubs that are rarely here or clubs that can't be in the Champions League because they can't reach it, at least the Europa League can be a cure for them and can be in the Champions League through direct tickets if they succeed in becoming champions.