Ramirez went to the disabled list for a calf injury in April, and the results of the MRI will likely determine whether another trip is necessary.
"He felt a little better," Dodgers manager Joe Torre said. "He feels it when he's out there running. He was out there earlier today. We're just going to take another look, so today he continues to be unavailable for us."
Monday was Ramirez's third straight missed game.
Jamey Carroll made his first start of the season in the outfield in place of Ramirez in left. Carroll, the Dodgers' utility man extraordinaire, has appeared in the outfield in 16 games over his nine-year career, 10 of those as starts. He played left field four times last season.
"He's played the outfield, I think he's played a time or two maybe even center field or right field," Torre said. "But he's played enough outfield, I'm comfortable. He's been out there a time or two taking balls. So we'll see."
Outfield help should return soon with Reed Johnson returning to baseball activities Monday before a likely rehab assignment. Johnson is out with a lumbar strain, and may be able to come off the disabled list the first day he's eligible, on Saturday at against the Mets at Dodger Stadium, but that'll be dependent on how much rehab he needs and its success.