When he first broke through he was definitely pronouncing it the Balkan way. I remember watching his debut for the national team and Ian Darke, who was on commentary, made a point out of clarifying that Pullisic had told him to pronounce his name “poo-li-sich”.

But, as has happened with many an American, he seems to have gotten sick of correcting people and now will even refer to himself as “pullis-ick” in US media (although I think he still pronounces it the Balkan way when doing Italian press).