Votto, who was expected to miss three to four weeks, is making good progress, however.
"It's going well," head trainer Paul Lessard said. "He's been doing all weight-bearing activity with different strength and agility drills and running."
The club hasn't put a target date on Votto's return.
"I haven't seen him so I don't want to speculate," Lessard said. "I'm just happy things are going well right now."
"You can't rush healing," Reds manager Dusty Baker said. "How many dates have you been given that have been wrong? Who can predict healing?"