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Actually I see Kloop also suitable if he goes to Bayern Munich. But his statement about his future seems to have been answered. So that seems unlikely to happen. Instead of Xabi I think Zidane could be another alternative. Because I read he is ready to work again at the moment.
Bayern Munich's chances in the UCL are still very big. They only lost 0-1 to Lazio in leg 1. Furthermore, they have many opportunities because of leg 2 in Germany. I am very sure they are able to qualify for the last 8.
Zidane is still possible to approach, but I'm not sure he would accept the project. We may need to wait until the end of the season for Bayern Munich to find a new coach, for now there are too many rumors that are unlikely to be true.
Apart from the issue of the new coach, I tend to want to discuss Bayern Munich's chances in the second leg of this season. Lazio will most likely have difficulty maintaining their winning aggregate because they are playing away match. I'm sure Tuchel will do everything to turn things around and take the lead in his home game, he has to make the most of everything he has for win the match.