Germany coach Julian Nagelsmann has named the severe knee injury of his new first-choice goalkeeper Marc-André ter Stegen ‘a big shock’ as he will likely be without him for many months. Barcelona captain ter Stegen ruptured the patella tendon during Sunday’s La Liga match at Villarreal and was to undergo surgery later on Monday, the club said. Spanish news reports said that ter Stegen could be sidelined for eight months. Ter Stegen has only just become Germany’s number one following the international retirement of Manuel Neuer. “The news of Marc’s injury was a big shock for us. We will miss hi…