SportsHummels: Should he stay or should he go?To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoSports04/27/2016April 27, 2016Mats Hummels is facing the biggest decision of his career. Should he leave Dortmund for Munich or maybe Manchester? Former World Cup winner Thomas Berthold has some advice for him.https://p.dw.com/p/1IdImAdvertisement