It's true, I think it's very difficult for Leverkusen to come back, and it's a shame that these teams had to eliminate each other, but I still want to see this game because Xabi must be preparing for the best game for them, so I'm curious to see how they play their last chance.
For me, Leverkusen is a team to respect, they have managed to Win many things, this opportunity is very difficult for Xabi, let's wait and see, but anything can happen , if Leverkusen manages to equalize, then that will be a disaster for Bayern.
Bayer Leverkusen is not a rich club in Germany and Bundesliga, and when Xabi Alonso came to take over a head coach position, they were in trouble and fighted around relegation zone. He helped them to stay in Bundesliga in a first season with them, and in a second position with them he helped them to win Bundesliga title against Bayern Munich with an unbeaten season. That's very impressive.
They played UEFA Europa League final match but failed by a big defeat under Atalanta. Xabi Alonso received many offers from big clubs including Real Madrid but he decided to stay with Bayer Leverkusen at least one more season (this one). Succeed or fail with Bayer Leverkusen this season, with or no titles, Xabi Alonso already made history with this club and he has a solid position in their club hall of fame.