Naturally, any player with an appearance or spell of time as a senior player spent at a second club is excluded. This includes loan deals for players in their younger years, so don't expect to see the likes of John Terry or Philipp Lahm—neither are one-club men in true form.
Indeed, as Zanetti featured for Banfield as a youngster he is also not a one-club man, though is entirely synonymous with Inter Milan.
As this list features still-playing or recently retired individuals, no players who ended their careers before 2000 will be incorporated within—it has become much less common in the past couple of decades to see one-club men compared to beforehand.
There is also the consideration of time to take into account: Technically, a 20-year-old in his first senior season is a one-club man, so to gauge longevity and quality, only those with a minimum of 14 campaigns with senior appearances at the same club will count.
To that end, a whole host of current top players just miss the cut but will bear watching as they will qualify over the coming years...presuming they don't move on. Some of those include:
Andres Iniesta, Barcelona
Bastian Schweinsteiger, Bayern Munich
Daniele De Rossi, AS Roma
Other notable one-club men who fail to make the cut:
Mikel Aranburu, Real Sociedad
Ledley King, Tottenham Hotspur
Marco Bode, Werder Bremen
Nir Davidovich, Maccabi Haifa