He doesn't have a timetable for when he'll return, either.
"There is none. It is whenever the Lord says that he's healthy and healed," Caldwell said Sunday. "And the medical staff will take a look at it after the Lord's decree and then we'll see what goes on after that."
Ansah, who led all rookies with eight sacks last season, did not practice during the spring as he continues to recover from shoulder surgery. He is one of three players, along with wide receivers Golden Tate and TJ Jones, to be moved to the active physically unable to perform list to start camp.
Those three players can be removed from the list and moved to the active roster at any point during camp.
Caldwell was not surprised by those three players not being ready to participate by the start of camp as all three are dealing with shoulder issues. Jones had surgery on his shoulder earlier this summer and Tate injured his shoulder during spring workouts.
Caldwell did say, though, he has been "pleased with" the healing progress of the players thus far.
The biggest concern of the three might by Ansah because Tate and Jones were at least available for portions of spring workouts. However, Caldwell isn't focused on that right now.
"One of the things I learned early on in coaching, I coach who shows up and instruct our staff to do the exact same thing. I cannot worry about how quickly the Lord allows someone to heal," Caldwell said. "I've got to do our business and at that point in time, when he gets healthy and ready to go, he'll be ready.
"Until then, whoever is out there lined up is going to get coached and coached hard and ready to play for us and win games. That's how we look at it and he's coming along and making great progress and doing everything he can to get there and I'm sure he will in a reasonable amount of time."
With Ansah out, it is likely either second-year player Devin Taylor or veteran Darryl Tapp will work with the first team when training camp officially opens Monday. Kris Durham or Kevin Ogletree will likely fill in for Tate until he returns from his shoulder injury as well.