Matt Harvey is dealing with an undisclosed medical issue that may place his Opening Day start for the New York Mets on Sunday in jeopardy.

Sandy Alderson declined to specify the issue, other than to say it was not related to an elbow or shoulder or anything else orthopedic.

"It's a non-baseball medical issue that we have to address," Alderson said. "It came up this morning as far as I know. There will be some follow-up tests and consultation that will take place over the next couple of days."

Asked if there is any gravity to the undisclosed issue, Alderson added: "I think it's a little early to attach any level of concern. ... I think we need to wait for more medical information before we decide it's of concern, or great concern, or no concern."

Harvey will be scratched from Tuesday's Grapefruit League start against the Miami Marlins. That had been slated to be his final tuneup for Opening Day.