It looks like Bayer Leverkusen already has very great players this season. If Bayer Leverkusen wants to use the funds collected to buy new players, it will further increase the burden of salary costs for the players every month. It is better to save the funds that Bayer Leverkusen has, and if you want to buy New players must wait for the number of players they have to decrease first so that the amount they spend each month is still balanced and will not create financial chaos at Bayer Leverkusen.
Xabi Alonso will never forgive himself if his outstanding team doesn't end up winning the Bundesliga title at the end of the day, because he has been patient all this while and have become one of the very confident coach to go home with one of these major trophy. Leverkusen in good touch and om streak winning, unbeaten in all Bundesliga matches played and they will continue from where they stop after the christmas break. At this current moment, Bayer Leverkusen doesn't need any new player or new strategy to ruin their chances of winning the Bundesliga title this season.
but I'm sure Xabi will think of just a few names to strengthen their team. they have indeed performed extraordinary. but Xabi is thinking about player rotation to maintain the fitness of his players.
especially if they manage to qualify for the Champions League next season, that will make their match schedule even busier, and Xabi must consider it now.
if there is a player that Xabi wants and suits his character. If the club sells the player in the transfer market, I don't think Xabi will rule out the possibility of trying for Leverkusen to get new players.