Sandy Alderson said Saturday that it was unusual for a player to refuse an MRI, as Noah Syndergaard did Friday, but said, "I can't strap him down and throw him in the tube."
Syndergaard is scheduled to start for the New York Mets on Sunday after he was pulled from his start Thursday because of biceps and shoulder discomfort.
Syndergaard is 1-1 with a 1.73 ERA in four starts.
"I think I know my body best," Syndergaard told reporters. "I'm pretty in tune with my body, and that's exactly why I refused to take the MRI."