I'd check 10 mins before the first wave of games. If he is still a game time decision then I'd go ahead and put in Keller. You can't risk Graham not playing and taking a 0 for his position.
QB- D. Brees, J. Freeman
RB- M. Lynch, T. Richardson, R. Hillman, D. Brown
WR- R. Wayne, M. Colston, L. Moore, J. Gordon, A. Brown
TE- A. Hernandez, K. Rudolph, B. Myers