Simmons had been on a rehab assignment with the Class-A Lynchburg Hillcats. He hit a home run Friday in the Hillcats' 2-1 playoff victory.
Simmons has been out of action for the Braves since suffering a broken hand in a July 8 game against the Philadelphia Phillies. He sustained the injury sliding head first into second base, and has missed about eight weeks of games.
Simmons was called up from Double-A Mississippi on June 2. In 125 plate appearances before sustaining the injury, he batted .296/.336/.452. Atlanta's record stood at 46-39 when Simmons was injured, and they have gone 33-21 in his absence.
Paul Janish has filled in at shortstop for the Braves for the most part with Simmons out, though super-utility man Martin Prado has played there occasionally as well. Simmons' return should provide a boost to Atlanta defensively, as that is a large part of the rookie's value.