Currently recovering from back surgery, there is an expectation that he will be fit before the January market.
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Ter Stegen is regarded as third-choice at Barca behind Joan Garcia and Wojciech Szczesny and is being encouraged by management to find a new club over the winter transfer window.
Besiktas are keen and have already made contact with Barca and Ter Stegen about a loan to the end of the season.
Ter Stegen has been warned by Germany coach Julian Nagelsmann that he needs to be playing regularly to be sure of a place in his World Cup squad.