Woo (shoulder) is scheduled to throw a bullpen session Sunday, Daniel Kramer of MLB.com reports.
Woo was removed from his most recent start last Sunday against the Astros after experiencing soreness in his right shoulder. The Mariners skipped Woo's subsequent turn in the rotation, but he was able to throw a bullpen session Thursday and will repeat the activity Sunday. How he comes out of Sunday's session will determine when the Mariners slot him back into their rotation during the upcoming week, per Kramer.