Manager Dusty Baker said Friday that McCullers (forearm) is dealing with a muscle strain and has no structural damage, Brian McTaggart of MLB.com reports.
The 28-year-old has already been ruled out for the ALCS after exiting his Game 4 start versus Tampa Bay with the injury, but he's avoided any long-term concerns. It remains to be seen whether McCullers will be available for the World Series should the Astros defeat the Red Sox. Jake Odorizzi was left off the initial playoff roster but will join Houston for the ALCS in the wake of the injury.