Giggs and United are at Arsenal tonight.
"You'd have to say Thierry Henry. He was one of the Premier League's great players. He scored great goals, he had great physique and speed and on his day he was just unstoppable. You can add Dennis Bergkamp as well because he was a really intelligent player," Giggs told manutd.com.
"Tony Adams is the other one. He was very tough to play against, especially at Highbury - you always knew you had to be at your best against that defence. It had so much experience."