If Leverkusen sells some of its main players, this will definitely affect the strength of Leverkusen performance and this will affect the situation in the upcoming matches, but for now I still believe Leverkusen will be able to be consistent until the end of the season and become the strongest challenger this season for Bayern Munich.
behind Leverkusen's success, there is a very great coach now. he is Xabi Alonso. He must be thinking about how his squad will face the rest of the season which will certainly be very competitive. not only in the Bundesliga but also in other competitions such as the European League.
they are in good form, I think Leverkusen will only bring in 1 or two players in the transfer market. and that is to increase the energy of the team. Regardless of whether there are players who will leave or not, I'm sure these players are players who don't play an important role in Xabi's strategy.
His mission is this season, at least he will keep his squad intact until the end of the season to ensure a trophy.