The 23-year-old, who can play as a right-back and center-back, is wanted by two top English clubs.
Per Sport Bild in Germany, Manchester United and Tottenham are the two suitors.
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Both clubs are keen to bring in the talented stopper, who was at the African Cup of Nations recently.
Given the Ivory Coast international is a hot property, a fee of 50 million is being mentioned.
Leverkusen are not keen to sell, but may not be able to resist if a bidding war begins.