Gyokeres' €24m (£20.7m/$28.2m) move from Coventry City to Sporting in 2023 was a record sale by the English side. The Championship outfit reportedly have a 10% sell-on clause, which could explain Sporting's insistence on selling for a higher price. But if Gyokeres does go on strike, the club may have no choice but to concede these demands in order to complete a deal.