Meanwhile, Xabi Alonso will definitely add depth to the squad to make it even better, if he succeeds in winning the treble winner then this plan will be easier to realize, because Leverkusen will get more bonuses. Xabi Alonso decision to stay could also influence the players decisions, I think most of their key players will choose to stay for at least one more season. By having better rotation options, Leverkusen can balance their performance in every competition they participate in, especially when playing in the Champions League and competing with other elite European teams.
If they want to maintain their performance next season then Leverkusen should try to add depth to their squad because they will be playing in the Champions League. The decision to stay is much better than leaving too quickly to take charge of another team because Xabi Alonso needs to prove his quality as a coach. Playing in the Champions League will mean that Xabi needs several quality players because the matches there will be much different from the Bundesliga.
I think the management will try to find a solution to add depth to the squad next season. Because they cannot possibly rely on a number of existing players next season because they are worried that if they experience injury problems, their plans to compete in a higher caste will be hampered by these problems.
It is clear that Xabi will bring in new players to complete his squad next season, but I still don't know whether this will be fully supported by Leverkusen management or not. I still want to see if Leverkusen will do everything they can to support Xabi Alonso in buying players. But for now Leverkusen should support them, because Xabi's decision is also very beneficial for them and also what Xabi has presented for them this season is truly extraordinary.
Financially, Leverkusen is in good condition, but I also don't know whether they have internal problems or not because as far as I know, there are no problems that they are facing. Hopefully Xabi Alonso can get what he needs to support his needs in every line. Because when they are in the Champions League, competition will be tighter and they need squad depth that is able to provide resistance to other strong teams. The reason is that they will face the best teams from every league in Europe.