Mats Julian Hummels (German pronunciation: [ˈmats ˈhʊml̩s]; born 16 December 1988) is a German professional footballer who plays as a centre-back for Serie A club Roma and the Germany national team. He came through the Bayern Munich youth academy before joining Borussia Dortmund on loan in January 2008 and officially signing for Dortmund in February 2009 for €4 million. He rejoined Bayern in 2016 for an undisclosed fee and was sold back to Dortmund three years later, having won the Bundesliga in all his seasons in Munich.
https://en.wikipedia.org/wiki/Mats_Hummels