Chelsea, Everton and Liverpool are aware a 25 per cent sell-on fee in Michael Keane’s Burnley contract could cost them.
Manchester United will be owed a chunk of the cash when the England international is sold, as is looking likely this summer.
This news could see Sean Dyche's side drive up the asking price as they aim to make as much from the transaction as possible.
Having turned down new deals at Burnley, Keane, who made his England debut against Germany in Dortmund last week, is set to be at the centre of a transfer tug of war once this season is over.