Manager Carlos Mendoza said Wednesday that Raley was diagnosed with a UCL strain in his left elbow after undergoing further imaging, Tim Britton of The Athletic reports.
Mendoza noted that Raley's UCL is healing, but the Mets will shut him down for two weeks before re-evaluating him, at which point the team will determine next steps. The left-hander has been on the injured list since April 21 and was initially expected to be activated after the 15-day minimum, but he hasn't made any significant progress toward a return to throwing.