L'Equipe says the Blades are keen on the Senegal international.
Championship pair Cardiff City and Swansea are also interested.
Sankhare is known both for his physicality and versatility, and is capable of both adding grit to the midfield and creating chances in more advanced positions. He can also fill in as a left-back, which could be of interest to Blades boss Chris Wilder as he looks to secure a back-up option for Enda Stevens.
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