McCullers (arm) will throw a bullpen session this weekend, Brian McTaggart of MLB.com reports.
McCullers was scratched from his scheduled start Wednesday due to arm fatigue, but he is apparently feeling good enough to try and throw again over the weekend. The Astros won't be in any hurry to rush McCullers back into the rotation, but if he feels better after throwing over the weekend, he could start for the club again at some point next week.