I have no doubt that Mourinho is a very experienced coach. However, Roma's squad is not strong enough. If the Roma management had made a bigger fund and given Mourinho full freedom to build his squad with the players of his choice, the Roma team would have been stronger.
However, Roma's performance this season has been quite good. Their opponents in the Europa League semi-finals are Leverkusen. This team is in pretty good form right now. But their defense is weak. If Mourinho is able to identify Leverkusen's weaknesses and create a good match strategy, Roma should be able to win against Leverkusen.
It’s true Mourinho's records and performances are going down but it doesn't really count as his fault, I can't say Roma has a squad that is good enough to compete at all levels and against top teams in Europe. Against Bayern Leverkusen it will be really tough and because of the records and name Xavi Alonso in the Europa league semi finals.
Sevilla are my favourite for the Europa League title as well. I think like this even in a season that Sevilla have had big difficulties in general. Because their recent performance has started to get more interesting. There is some good level of improvement as it can be clearly seen from their recent results. They don't lose games easily most of the time from now on.
I remember how good they played against Manchester United in the second leg as well. This must be a warning for Juventus to defend them well in their matchup. Juventus need to be more capable of scoring multiple goals in a game as well. If they perform similar to the one against Sporting then their job will be really difficult.
I guess Manchester United was all they needed to get back to winning ways and they got it on a platter of gold. It feels good finally seeing Sevilla picking up from their poor season and getting back to top form again because to defeat Juventus, this level of form will be needed if they are to survive the semi finals.