There are plenty of great options: Giggs, Scholes, Baresi, Maldini, Facchetti, Puyol, etc.
For me though, the greatest is Francesco Totti. The others above played for clubs who won multiple trophies, and all won the champions league at least once. Aside from a smattering of Coppa Italias and one Scudetto, Totti didn’t win anything with Rome.
For me, it’s easier for a top player to stay at a top club, rather than be a top player like Totti and stay at a club that was rarely considered the best in Serie A. For my money, he is the greatest one-club man of all time.
Who would you choose?
It’s Giggs and it’s not even close.
I love Totti, the gorgeous bastard, but Giggs, holy fuck, such a ridiculous career.
Man’s out there winning titles for United twenty years apart. Any cup worth winning he’s probably won it at least twice. He scored United’s greatest ever goal. He played a million games.
Familiarity breeds contempt, and of course contemptible behaviour breeds contempt, and he’s a complete dick, but it takes something special to be irreplaceable to a club that successful for that long.