Now fully fit after early season back surgery, Ter Stegen is strictly third-choice at Barca behind Joan Garcia and Wojciech Szczesny.
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Barca management have encouraged Ter Stegen to find himself a new club in January.
And Voller told Kicker: "It doesn't matter if he stays in Barcelona or somewhere else. In the end, he has to play.
"And then we will all rejoice on his behalf if he – after many years as a world-class target man in the shadow of Manuel Neuer – gets the opportunity to stand on target at a World Cup."
