Woo (shoulder) is scheduled to throw a bullpen session Sunday, Daniel Kramer of MLB.com reports.
Woo was removed from his most recent start after 75 pitches due to shoulder soreness. The right-hander's subsequent turn in the rotation was skipped, but he was able to throw a bullpen Thursday and is slated for another Sunday. How he comes out of Sunday's session will determine how/when the Mariners put him back into their rotation, per Kramer.