According to the Marlins, an MRI has revealed that relief pitcher Juan Carlos Oviedo has suffered a UCL sprain in his right elbow.
As of Monday evening the team has not given a timetable for his return.
Oviedo walked off the mound Saturday night in a rehab appearance at Triple A New Orleans after recording only one out because of right elbow discomfort.
Oviedo was back in Miami Sunday and was examined by team doctors. Manager Ozzie Guillen spoke to the media at 4:15 Monday afternoon and said Oviedo's MRI results were being evaluated.
Oviedo is eligible to return from his eight-week suspension for age and identity fraud on July 23.