Mats Hummels, born December 16 1988, is a German central defender who plays for Borussia Dortmund . Hummels started his career with the Bayern Munich reserve side in 2006, where he made over 40 league appearances before making his Bundesliga debut with the senior team in 2007. Born in 1988, Hummels moved to Borussia Dortmund on loan in January 2008, before completing a full transfer in February 2009. After enjoying great success with Dortmund during the era of Jurgen Klopp, Hummels rejoined Bayern Munich in May 2016. Hummels also won the World Cup with Germany in 2014. He made a €30 million move back to Bayern in 2016.