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I don't really know why many people think that Bayern Munich's performances will decline or will not improve under Kompany as head coach next season. Kompany is not that experienced as a coach, but that shouldn't mean we judge him negatively. It would be better to allow the season to start and see their performances before rating Kompany as a poor coach. As for me, I believe that Bayern Munich will surely be in the race for winning the Bundesliga trophy next season. Bayern Munich will be a great challenge for Leverkusen, not to mention Dortmund. In fact, from my observation, I can't say if Dortmund will even be a good contender for next season's Bundesliga trophy, but let's see what happens.
In my opinion, why do many people think that Bayern Munich performance will decline or not improve under Kompany as head coach next season, because it is not yet time for Kompany to become a manager at a club as big as Bayern Munich and they have just failed to win the Bundesliga after dominating as champions for 11 consecutive years. It's natural that many people think Kompany's appointment was a blunder or panic decision made by Bayern Munich management because they seemed to be breaking their own tradition of always looking for quality coaches after failing to win the title. 12 years ago, precisely when Dortmund won the Bundesliga, Bayern Munich immediately made the best decision by appointing Jupp Heynkes as head coach, the result was that Bayern Munich immediately became champions again.
Before appointing Kompany as coach, Bayern Munich management really wanted Xabi Alonso as coach, but he refused and chose to stay with Leverkusen. The names Julian Nagelsmann and Ralf Ragnick also appeared on Bayern Munich radar, but they also rejected the offer, so Kompany is an alternative to Xabi Alonso, Julian Nagelsmann and Ralf Ragnick. Bayern Munich is taking a gamble with Kompany, he has the potential to become a great coach and Bayern Munich could get out of decline, but the risks are also very high. Hopefully this assumption is wrong and Kompany can improve Bayern Munich performance to win the Bundesliga again so that Harry Kane immediately ends his curse without a title next season.