Mattingly would not elaborate on Greinke's condition or who might replace him, although the Dodgers have few options besides rookie Carlos Frias, who pitched four innings in relief of Dan Haren on Sunday.
"Nothing to talk about right now," Mattingly said. "We'll let you know more [Wednesday]."
Greinke previously said he's pitched through similar arm discomfort and theorized that the 20-game stretch without a day off that ended Sunday might have contributed to the issue.
Ken Gurnick is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.