General manager Walt Jocketty is contemplating making a roster move.
"I'll know better probably the next day or so," Jocketty said. "We may end up doing something. He was feeling better today, so we'll see."
Rolen, currently listed as day to day, does not know when he might return.
"Hopefully in San Diego," Rolen said.
The Reds conclude the first half with a four-game series against the Padres beginning Thursday.
"I'm mobile and walking around," Rolen said. "No, I'm not comfortable. I'm not going to do any baseball stuff. I am getting around better, for sure, and improving. But I've not progressed to jumping jacks yet."