Traore has spent the second-half of this season on-loan with the French club.
He has played 14 competitive matches and produced one assist.
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Fotbolldirekt.se says Nantes wants to buy Traor, even though he has not yet netted for them. The French club has a purchase option, but it is unclear what it is.
Traore joined the Blades last summer from Sweden's BK Hacken.