They're not saying much else.
"I don't know what I'm going to miss," Stafford said Monday.
"Week 1, to get dinged up again, it's not fun," Stafford said. "I'll be back out there as soon as I can."
Stafford missed six games last season as a rookie with a banged-up left shoulder, an injury he said was similar to his current one, and a sore right knee.
"We've had some good returns from his tests," Schwartz said. "It doesn't look like surgery is going to be needed."
The Lions will take Stafford's long-term health -- and importance to the franchise -- into account when deciding when to clear him to play.
"We don't want to rush him back," Schwartz said. "We don't want to put him out there if he's not able to make all the throws, or if he's protecting it and can't take a hit."
"To say he won't be missed team-wise that would be telling a lie," running back Kevin Smith said. "But that is why you go out and get depth."
The Associated Press contributed to this report