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It would be really silly if it happened, Leverkusen became strong because of how Xabi strengthened his squad so excellently that this season finally achieved a very surprising achievement. And he also has to win Leverkusen in the UCL cup next season, this is increasing because this season they are only in the UEFA Europe League. And it proves that Leverkusen is able to compete with the top clubs in Europe.
And it looks like Xabi will still be in Liverpool. As in the news, Xabi Alonso finally gave a statement that he would stay at Leverkusen next season. This made several big clubs who wanted this coach quite disappointed. Among them are Liverpool and also Bayern Munich. Xabi is one of the best coaches this time, in fact, in my opinion, he is the best this season. Therefore, it is not surprising that many big clubs want him.
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Staying at Bayer Leverkusen implies that he has a big plan for his own career. He does want to rush his steps to have bigger challenge too early in his managerial career. This is a wise decision for a manager who have been starting his career with remarkable records on his early journey. He needs to test the team he has built in the Champions League next season.
If he keeps the success next season, his next club would probably be Real Madrid considering Ancelotti could be ending his career at Madrid after next season, and Liverpool have no habit to sack manager after one season managing the club. this is most possible scenario to happen that aligns with the path the managerial career of Alonso. I am very doubtful that he will accept the job at Bayern Munich, because it could be detrimental choice for his legacy at Leverkusen, because Bayern is their direct rival who is known to 'steal' the best from their rivals.