Even Galatasaray had a bid rejected, £12.9m, according to Sky Sports.
"It is understood Galatasaray's bid for the box-to-box midfielder - who has scored five goals in 22 appearances in the Jupiler Pro League - falls short of Sheffield United's valuation, with the club also rejecting a £10m bid from AC Milan earlier this year for the Mali U20 international."
Ismaila Coulibaly has come to the attention of several top European clubs after impressing on loan at Belgian club Beerschot; Sheffield United rejected a £10m bid from AC Milan earlier this year; the Blades, who have just been relegated from the Premier League, signed him for around £2m
www.skysports.com