Viktor Gyokeres accused of 'blackmailing' Sporting Lisbon as furious club president hits back at Man United target after he 'threatened to go on strike' - and names the price they WON'T accept for star striker

Viktor Gyokeres has threatened to never play for Sporting Lisbon again if the club do not lower their high asking price for the Swede, according to reports, amid a messy potential exit.