The Europa League is going great at the moment. Roma wants to push themselves forward in a great way, in terms of which we see the coach of the Roma team is trying to apply great tactics for the players. But I think players really need to learn new strategies and manage the game in different ways. Then the Roma team will be in a good position.
Xabi is very good coach for now in bundesliga. 
Bayern leverkusen was unbeaten from 14 games in total. It can be a proof even though xabi can be categorized as a new coach but he shall not be underrated. Mourinho knows so well who xabi alonso is. that's why mourinho will not take a sloppy decision against leverkusen.
As roma must be using full squads to make sure the club will able to beat it. Leverkusen is such a strong team that can't be underrated. It was able climbing up instantly from the bottom to the top in a short time.
Im sure that if xabi already anticipated the strategy that may be using by the special one in upcoming games.
Leverkusen surprisingly lost against koil last night. It has proven that if leverkusen is still having weakness spot at this moment even though it was the first lose after xabi was coming to the club.