The stress fracture was originally discovered during the NBA finals in June. Ginobili missed the 2014 FIBA World Cup after the Spurs denied him permission to play for his native Argentina in the tournament.
Ginobili said he doesn't feel pain anymore, but on the court he's not at the level he needs to be at.
"(I'm) way behind basketball-wise," said Ginobili, according to Project Spurs. "I am very insecure with the ball, but I am pain free.
"That hasn't happened in a long time, so I'm happy about that," he continued. "Sometimes I get a little impatient. I am so far behind, and I want to be useful and help the team out."
In the Spurs most recent preseason game on Saturday, Ginobili played 16 minutes and finished with six turnovers, three rebounds and two assists. The 37-year-old shot 1-of-5 from the floor and totaled five points.
San Antonio opens the season on Oct. 28 at home against the Dallas Mavericks.
- Molly Geary