Jennings went on the 15-day DL on Aug. 27 with a bruised left knee.
"He had a pretty good day [on Friday]," Cash said. "He hit off the machine, so he's feeling good. But as far as a timetable, we're still not there yet."
Cash said Jennings has done some running in the swimming pool, but added, "He's not out there doing sprints yet."
Casali was placed on the 15-day DL on Aug. 26 with a strained left hamstring.
"[Casali is] just going through the regular rehab," Cash said.