“There's no figure for him," Orman told NTV Spor.
“These players are like my children – I have an interest in their careers. They aren't machines. (Kylian) Mbappe went to Paris Saint-Germain for €180m (£158.5m), (Naby) Keita for €70 (£61.7m) or €80m (£70.5m), so placing a higher value than €20m on Tosun is not crazy.
His contract at Oakwell expires in June and he has just turned down a new deal.