Next to no chance of getting them at ANZ as the team buses drive in underneath the stadium. Your only chances are...
1) player(s) make their own way home and you happen to catch them at the right exit. Not many do this.
2) the Dogs have a pre or post match function (usually 1 or 2 players only) and a member like myself or Razor77 get you in. Even still they don't sign much
However, you can often catch ex players etc if you are lucky and happen to have a massive wad of cards handy to hedge your bets on who will be there.
Hope that helps