Manchester United have made a €30 (£21m) bid for Borussia Dortmund defender Mats Hummels, according to leading German newspaper Bild.
The 26-year-old has been widely reported as United top summer target, and his future at the Bundesliga is now even more periolous after last week's news that Dortmund manager Jurgen Klopp would be stepping down at the end of the season.
The report in today's Bild claims that the opening bid has been made, but Dortmund are hoping for a figure closer to $45m (£32m).
The German World Cup winner Hummels is under contract with Dortmund until 2017.
He already has two Bundesliga titles to his name having won back-to-back championships with Dortmund in 2010-11 and 2011-12, plus a German Cup success in 2011-12 and the unsuccessful Champions League final appearance at Wembley in 2013.
Earlier this season, Hummels had said that he would contemplate a move abrad. He has played in the German top-flight all of his career, having moved from Bayern Munich permanently in 2009.

"I think moving abroad will be good for my professional and personal well-being,” said Hummels. “Eventually, I'd like to leave the Bundesliga.
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