Votto was originally expected to join the Reds in Houston after a few rehab games with Class A Dayton. On Saturday the Reds sent him to Columbus.
Manager Dusty Baker hopes Votto can join the Reds on Monday when they start a nine-game homestand, but that depends on whether Votto feels he's ready to return.
The Reds hope to know more about Votto's status on Sunday.
"That's a big question that none of us can answer yet," Baker said.
Votto entered Saturday 1-for-5 in three rehab appearances, all with Dayton. The Reds are 31-15 with him out of the lineup.