Most people would probably give the nod to George Best, who is widely recognized as one of the 10 best players in the history of the game, or Sir Bobby Charlton, the English legend who holds the record for most goals at Manchester United.
One could make a case, however, for more modern-era players like Cristiano Ronaldo and Eric Cantona, who were beyond fantastic in their brief time at Old Trafford.
That's the thing about Giggs, who was voted as the best player in Premier League history as part of last year's EPL 20 Seasons Awards—he's been great for so long at United, it's hard to pick anyone ahead of him, despite that in any given season of his career with the Red Devils, he may not have been the best player on the field.
From Peter Schmeichel to Cantona to David Beckham to Roy Keane to Edwin van der Sar to Ronaldo to Ruud van Nistelrooy to Wayne Rooney to Nemanja Vidic to Robin van Persie, Giggs has always been there and always been great, if never the greatest. That said, his longevity, sustained excellence and ability to adapt his style as the game evolved make him one of the true greats—and maybe the greatest—in Manchester United history.