Brault left his start Friday against the Brewers with left shoulder discomfort, Jason Mackey of the Pittsburgh Post-Gazette reports.
The severity of the issue is not yet clear. Brault will get at least a brief rest due to the All-Star break, and the Pirates could place him on the injured list regardless of how bad the injury is and have him come back to start July 16 when a fifth starter is next needed. Brault had allowed just one run on three hits in four innings of work prior to exiting Friday's game, walking two while striking out four.