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Bayern Leverkusen should not even try to do that because they will lose relevancy without those key players by next season. A lot is expected from them after a brilliant season from them in the just concluded season. They need all of their key players and even more in order to be at their best next season also. Xabi Alonso staying back with them should help convince this players that have trained under him for up to a season and bringing out the best in them. He shouldn’t gamble it and allow them to go thinking that he’ll get a good replacement for them. If he continues with this current Bayern Leverkusen squad, I feel he’ll excel better in the next season than he did in the first season with them.
A lot of people have high hopes in them and they believe with Xabi Alonso staying with them for the next season, they won’t be less of their performance as they did in the first season but rather improved in all aspect as they prepare to participate in the champions league which is the most competitive of all competitions they will be playing in next season. Their undefeated run has given them an upper hand and they should utilize it very well as teams will be more sceptical playing with them from next season.
Leverkusen will certainly have great difficulty repeating the same achievements as before. Competition in the Bundesliga is expected to increase after Bayern Munich and Dortmund start the new season, as well as other matches in Europe. Leverkusen will play in the Champions League, but they will probably be thrown into the Europa League if they fail in the group stages. They will never be the same even if Xavi Alonso will try his best, but still have a good chance.
I never think Leverkusen can match their unbeaten record next season, but everyone can expect logical things about them next season. Xabi Alonso has a big responsibility to maintain his team's performance, this is the most difficult challenge I imagine for him next season.