Zynga, behind the popular Farmville game, has asked for an "application for a preliminary finding of suitability" from the Nevada Gaming Control Board.
Blatter remains undeterred and before Sunday's draw for the preliminary round of the 2010 World Cup finals, said Fifa must "convince the purists in the application of European law".
The company previously said there had been a "slight delay" in the finalisation of the Belfast planning application due to the increased size of the proposed store and some unexpected delays in the preliminary site investigation process.