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 neither won the world cup, nor is a one club man. He had almost 100 appearances at Gladbach.
Oh yeah, he got injured right before. I forgot. Still, he’s had every opportunity to leave Dortmund to be successful at a bigger club. He stayed loyal to his childhood club and he’s probably retiring there. Sure, he’s technically not a one club man, but for all effects and purposes he is. Not really worth arguing about this