Speaking to Grosvenor Sport, O'Hara said: "Bukayo Saka isn't world class. He’s a great player in a very good team, but I look at guys like Cole Palmer and Lamine Yamal, who in my opinion are world-class players. They're a level above Saka – it's as simple as that.
"Yamal looks set to be the star man at Barcelona for the coming years and you know they’ll win trophies with him; so I’d have him over Saka for starters. Palmer also looks like the best player in the Premier League, which means you can argue that he is the best player in the world.
"I might be getting carried away there, but Palmer looks like he can do anything on a football pitch, nothing fazes him at all. As I said, Saka is a great player, but Palmer is another level."