Posted in Web Mats Hummels Player Profile – ESPN FC Bayern’s Mats Hummels to return to Dortmund. Transfers Jun 19, 2019 Stephan Uersfeld. Read. Dortmund have signed Hazard, Brandt and Schulz but what else is needed to unseat Bayern? : http://www.espnfc.com/player/84627/mats-hummels