Hummels understands Lahm's retirement decision
![Hummels understands Lahm's retirement decision](http://static.goal.com/4447300/4447372_gallery.jpg)
![Philipp Lahm and Mats Hummels applaud Bayern supporters Philipp Lahm and Mats Hummels applaud Bayern supporters](http://static.goal.com/4447300/4447372_thumb.jpg)
Although Hummels is surprised by his skipper's announcement to call it a day, the defender insists it's a decision he understands
Although Hummels is surprised by his skipper's announcement to call it a day, the defender insists it's a decision he understands