"I feel better but I can't swing the bat," Encarnacion said on Tuesday. "I still feel it a little bit. But it's a lot better than it was two days ago."
Encarnacion said he had been undergoing treatments on his back but wasn't available to pinch-hit.
Reds manager Dusty Baker did not know when Encarnacion could return to the lineup.
"He's day-to-day, not sure," Baker said.
To fill in for Encarnacion, Jeff Keppinger moved from shortstop to third base and rookie Paul Janish played shortstop. The move also helped Keppinger preserve his legs on the artificial turf after returning on Sunday from a fractured left kneecap.
Adam Dunn was moved up the lineup to the second spot while Keppinger batted sixth.
"Without Edwin, and they have four lefties in the bullpen, I have to be careful not to stack the lefties up too much," Baker said.
Mark Sheldon is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.