article_snippet: The central midfielder, 27, has not agreed a new deal with the club and has been linked with a return to BundesligaBundesliga, with Bayern Munich and Schalke Schalke possible destinations.
article_snippet: I will give everything for this shirt until the last day of my contract, there should be no doubt about that.'
highlights_snippet: German international has struggled with injuries in Spain this season .
  
highlights_snippet: Bayern Munich and Schalke thought to be interested .
  
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