Arsenal’s deal for Manchester United target Viktor Gyokeres is reportedly on ice due to valuation differences.The Red Devils have made signing a new striker a priority after a dismal year in front

But while Gyokeres is keen to push through a switch to the Emirates, the player’s agent, Hasan Cetinkaya, has become embroiled in a bitter feud with Sporting’s president, Frederico Varandas, over a proposed transfer fee for the Primeira Liga top scorer.