Craig, who leads the Cardinals with 97 RBIs despite missing the last 18 games, initially was diagnosed with a sprain in his foot.
But the Cardinals will take another set of X-rays before determining whether the All-Star will resume baseball activities.
Cardinals general manager John Mozeliak insisted that the team has not decided whether Craig will rehab in the fall instructional league or if he will participate in simulated games in St. Louis.
"I hate to focus too much on that because I don't know if he's ever going to be physically ready to do that this year," Mozeliak said, according to the St. Louis Post-Dispatch. "The way I'm always more comfortable dealing with players is when they're cleared to go do baseball-related activities. He hasn't been cleared for that yet."
Craig suffered the injury Sept. 4 against the Cincinnati Reds. After X-rays in Cincinnati were inconclusive, he was sent to St. Louis for an MRI and more X-rays the following day, and those tests indicated that nothing was broken.
Craig is batting .315 with 13 home runs this season and boasts a .454 average with runners in scoring position, the best in the majors.
The Cardinals have clinched their third consecutive postseason berth and entered play Tuesday with a two-game lead over the Reds and Pittsburgh Pirates atop the NL Central Division.
Matt Adams has filled in admirably for Craig at first base, batting .329 with seven home runs and 14 RBIs in his last 19 games.
Information from The Associated Press was used in this report.