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Although in recent times they have not really been epic with the number of goals they score in a match I still believe Bayern Munich will do good but if Dortmund brace up and further improvement on their tactics I think they still have the chances of being a good contender to Bayern Munich and be at the top, so I will say let's not rule out Dortmund yet there's still enough room for improvement and possibilities.
for Dortmund it seems that there is only a small possibility of improving the quality of its performance this season and will hardly even be a challenger to Bayern Munich until the end of this season. It all started with the sale of talented player, currently no one has filled the void with equivalent players except in the middle of season Dortmund was surprisingly able to develop several players with new talents after which they increased drastically. but it will be very difficult if you look at the players they got from market this season, it seems like the more equal challenger is Leverkusen.