Hummels injury costing Dortmund
Last season, Borussia Dortmund could arguably have lost the title because of the lack of experience in that side. That nous to be able to usher your team past the finishing line when you're not really playing at your top-level was missing from this team.
In signing Mats Hummels this summer, Dortmund were not only able to bring in some quality experienced defending, but also a proven winner with both Bayern Munich and Germany. The feeling since the start was this campaign was that with the additions in the summer and the returning Hummels, Dortmund could once again really challenge for the title.
As Hummels was unable to continue and was replaced by Zagadou, Dortmund saw first-hand what could be the result if Hummels' injury keeps him out for a long period of time. His leadership at the back could be key to keeping teams at bay and calming the team when under pressure. It's something Dortmund missed for most of the second half and will definitely miss if he's absent for the long term.