Arsenal deal for Viktor Gyokeres at risk as Sporting issue threat over transfer fee

Sporting are demanding a higher fee from Arsenal for Viktor Gyokeres (Getty)Arsenal’s deal to sign Viktor Gyokeres could be at risk as Sporting CP have threatened to increase the striker’s asking price.Earlier this week, Sporting’s president, Frederico Varandas, hit out at Gyokeres’ agent over suggestions that a transfer fee had already been agreed ahead of the summer transfer window.Gyokeres has a €100 million (£85.1m) release clause in his contract but