Ruh-ro. PORT ST. LUCIE, Fla. -- Josh Edgin is headed for an MRI on Tuesday for elbow "discomfort," an alarming development for a club with little safety net in that lefty relief role. "It's elbow. It's everything. Arm. It's discomfort," Edgin said. Edgin's fastball velocity sagged during last year's spring training and he failed to make the Opening Day roster. Now, Edgin has similar issues with his fastball velocity. He gave up consecutive-run scoring triples to lefty batters in Monday's Grapefruit League game against the Miami Marlins while registering a modest 88 to 91 mph with his fastball. However, pitching coach Dan Warthen on Tuesday told ESPNNewYork.com that last year's issue is different from the current one. A year ago, "we felt like he was out of shape," Warthen said. Warthen said the Mets will back Edgin off pitching in games for an undetermined period. Edgin said the entire forearm is uncomfortable. Edgin consistently was missing the strike zone, mostly to his arm side, on Monday. The Mets' other lefty relief candidates include Rule 5 pick Sean Gilmartin, Scott Rice, Dario Alvarez and Jack Leathersich. The Mets have Darin Gorski and former Tiger/Marlin Duane Below in minor-league camp.