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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.
Bayern Munich management is currently trying to find a replacement for a new coach, but several big names are still hesitant to join even though several of them have been contacted and offered proposals. Not only Bayern Munich, but Liverpool and Barcelona are also negotiating with several coaches so that some of them will consider the existing proposals.
As for their chances in the Champions League, I think it's still reasonable to expect them to progress to the quarter-finals. Lazio leads 0-1 on aggregate, that's not much at all but Lazio has a chance to keep it. Bayern Munich have home advantage in the second leg, if they can take advantage of that then Lazio should not have a high chance of winning the match or even maintaining the aggregate.