MRI results on Ribalta's right forearm came back negative Tuesday, Kyle Williams of TheBanner.com reports.
Ribalta landed on the injured list Monday with forearm inflammation, but the results of his tests confirmed that he isn't dealing with a structural issue. The Nationals will now shift their focus to making sure the 28-year-old gets enough time to rest and recover, and with the team well outside of the hunt for a postseason berth, there's no guarantee he pitches again this season.