And we asked how those sides compared with the record-breaking 2017/18 champions Manchester City.
“When I think of Pep Guardiola’s City, you think of panache, passion, poise, poetry in motion,” says Sutton.
“They are a team of absolute beauty. When you think of what he’s developing, they’re going to be unstoppable for years to come.”
But the 1994/95 title-winner with Blackburn Rovers believes City have some way to go to match the achievements of United’s treble-winning team.
“When I think of the great United team of '99, I think, attack, attack, attack. A swashbuckling, exciting, never-beaten United.
"They were sensational. A joy to watch, but not to play against. The greatest team of all-time in my book.”