Why does Mats Hummels cut holes in his boots? - YouTube
Manchester United transfer news: Dortmund to consider Hummels bids - Manchester Evening News
Mats Hummels Trains in Blackout adidas Boots - SoccerBible
Soccer Football - Champions League - Group C - Ajax Amsterdam v Borussia Dortmund - Johan Cruijff Arena, Amsterdam, Netherlands - October 19, 2021 Borussia Dortmund's Mats Hummels during the warm up
Family ties - The brothers Hummels :: DFB - Deutscher Fußball-Bund e.V.