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?
Football is way more than these big name players. For me it’s Steve Bull. Scored 50 goals in a season twice running. Played for England when he was still technically a 3rd division player.
Could have gone anywhere but stayed with his beloved Wolverhampton Wanderers.
I’m sure there are many other similar stories from fans of other clubs.