Borussia Dortmund confirm Mats Hummels has asked to LEAVE the club this summer for Bayern Munich - Mirror Online
Borussia Dortmund leader Mats Hummels explains why his young vibrant teammates are so exciting - CBSSports.com
Mats Hummels on what convinced him to make Borussia Dortmund return
Manchester United transfer news: Mats Hummels 'tells team-mates' his Borussia Dortmund exit is on the verge of being sealed | The Independent | The Independent
Borussia Dortmund CEO Hans-Joachim Watzke Labels Mats Hummels As World Class
Mats Hummels to rejoin Borussia Dortmund from Bayern for £34m | Bayern Munich | The Guardian
Borussia Dortmund to Use Mats Hummels as Make-Shift Forward if World Cup Winner Re-Joins Club - Sports Illustrated