He's now missed all of training camp recovering from the injury, and Colts head coach Jim Caldwell is unsure if Manning will be back in time to play in any of the Colts' preseason games.
Here's what Caldwell said (via Pro Football Talk):
"Doing well, coming along. He's working extremely hard at it. Doing all the little things that it requires to get him where he wants to be. I think you guys know as well as I do he's ready to go and will be out there because he is chomping at the bit, that's for certain."
As of Tuesday, Manning remains on the physically unable to play (PUP) list.
Most have speculated that the Colts will keep Manning out of any exhibition games and that he will be activated from the PUP list before the regular-season opener.
That is, of course, assuming he's healed from his surgery.
Stay here for updates on Manning's recovery from neck surgery.