Smith (forearm) will have an MRI on Tuesday, Scott Lauber of the Boston Herald reports.
Smith was removed from Monday's spring game due to cramping and tightness in his forearm. He acknowledged that he's worried about the injury, even though Red Sox manager John Farrell said Smith's removal was precautionary. Smith, Koji Uehara and Junichi Tazawa are all candidates to pile up holds in front of closer Craig Kimbrel.