Hisashi Iwakuma faces a delay to his comeback, originally scheduled for late spring, after a lingering right shoulder injury halted a simulated game Saturday at the Seattle Mariners' complex in Peoria, Arizona.

Iwakumi, who was invited to the Mariners' spring training this season on a minor league contract, stopped 7-8 pitches into the simulated game after experiencing issues with his surgically-repaired shoulder.

"I don't know how severe it is; he just didn't feel right and thought it was best to shut it down and give it a little time," Seattle manager Scott Servais told mlb.com.