McCullers (back) threw Saturday for the first time since landing on the disabled list, Jake Kaplan of the Houston Chronicle reports.
Everything apparently went well, and McCullers is scheduled to throw a bullpen session in the coming days before the Astros determine when he'll return to the rotation. If all goes well, the Astros are hoping the 23-year-old will be able to rejoin the big club at some point during their upcoming seven-game road trip.