On the pitch during 90x2 anything can happen, and maybe AS Roma will be very lucky in this semifinal, so they can beat Leverkusen. Even though Leverkusen is very strong, there is no guarantee that they will actually win this match. This depends on how their game will be, whether they will be able to apply De Rossi's instructions well or not. Because of course they have learned all the advantages of Leverkusen, and they will look for ways to overcome their advantages this season.
So far I hope Leverkusen can continue to improve even though they no longer have the burden of the league, besides that we can say Roma will be their first strong opponents this season after they only faced the likes of Qarabag and Westham before reaching the semi-finals, so we cannot be sure if Leverkusen can or cannot maintain their unbeaten record this season when they face Roma later.