"I think Dez will definitely need some at-bats," Cash said. "How many, I think it's a little too early to tell. I would say consecutive games at least."
Jennings went on the 15-day disabled list on May 3 with left-knee bursitis, which most feel was a product of the pounding from playing on artificial turf.
"Dez is still getting some treatment, ramping up his workouts," Cash said. "Running a little more, hitting."
Matt Moore (Tommy John surgery) threw a bullpen on Friday after throwing one on Wednesday.
"I do not know how that went," Cash said. "But I talked to Matt yesterday on the bench after his live BP [on Wednesday] and he felt really good. Like total normal. Great sign."
Moore is expected to pitch in a simulated game at extended spring on Monday.
Cash also said that infielder Nick Franklin (left-obique strain) is "doing really well."
Franklin is hitting .286 in seven games for Triple-A Durham and was scheduled to be off on Friday before playing for the Bulls on Saturday and Sunday.
Bill Chastain is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.