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They were able to do this because they have strong and stable finances compared to other Bundesliga teams, allowing Bayern Munich to build a team with above-average strength.
Next season, I think it will be the same; Bayern Munich will continue to dominate. I think so after seeing the changes made by the Bundesliga teams, and indeed, no team has built a team to match Bayern Munich.
Given the increasingly significant shift in team quality, Bayern Munich remains a team with a strong chance of winning the Bundesliga trophy. They have been very active in the transfer market, bringing in several quality players, while their rivals seem to be stuck in place, especially Leverkusen, who recently lost their coach and several top players. Bayern Munich is in the same position as PSG in Ligue 1, and the domestic league trophy is guaranteed to be theirs. The coach simply needs to maintain his team's consistent performance in the UCL, as the challenges there are far more competitive than in the domestic league.