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?
He was an outstanding free kick taker. From his 131 goals, 61 were via free kicks. He was also São Paulo’s main penalty taker and captain throughout most of his career.
Probably his most iconic goal was his 100th, were he converted a perfect free kick against SPFC’s fiercest rival Corinthians.
https://youtu.be/WU1Vum9cDbE?si=DFTB-PjreRnUS2-8
That is probably my favorite goal of all time. I was a kid when it happened and I went nuts (I’m a São Paulo supporter).