Manchester United have put forward an opening £21.5million offer for Dortmund captain Mats Hummels , according to German newspaper Bild . The Germans value their captain at £35million but in United 's favour he has had a relatively poor season occasionally clashing with supporters when results went against them earlier this season . Dortmund are keen to bring in Sami Khedira from Real Madrid as their new captain amid a summer of big changes following Jurgen Klopp 's announcement that he will leave the club at the end of the season . Manchester United are reported to have put in a £21.5m bid for Dortmund defender Mats Hummels ( left ) Hummels ( left ) struggled early in the season for Dortmund and United hope to use that to their advantage . German paper Bild have reported the bid has been placed but Sportsmail understands the offer has n't gone in yet . German World Cup winner Hummels is under contract with Dortmund until 2017 but earlier in the season admitted he would like to play abroad at some point in his career . He told Kicker : 'Some days I think I would definitely like to move abroad but then , other days , I think I do n't fancy it at all , ' he said when asked of United 's interest . 'Basically , I think moving abroad would be good for my professional and personal well-being . Eventually , I 'd like to leave the Bundesliga . ' I have had many conversations with the leaders of Dortmund , where I know I am a big part of the team , but I am yet to make a decision about my future . United also retain an interest in Hummels 's Dortmund team-mate Ilkay Gundogan , who the club see as a potential successor to Michael Carrick . Ilkay Gundogan ( right ) is also a target for United as they look to revamp their squad in the summer . Dortmund want to bring in Real Madrid 's Sami Khedira ( right ) as their new captain for next season .
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