Leclerc was placed on the 45-day injured list Thursday with a Grade 2 strain of his teres major, Levi Weaver of The Athletic reports.
The injury is similar to the one teammate Corey Kluber (shoulder) is dealing with, though it's apparently a little less serious. Either way, he's set to receive a PRP injection before being shut down for around four weeks. The hope is that Leclerc will be able to return for the end of the season. It's unclear who will step in as the Rangers' closer in his absence, though Nick Goody picked up the save in his place Wednesday. Brett Martin, Jesse Chavez and Jonathan Hernandez are also options, along with Joely Rodriguez (lat) and Rafael Montero (elbow) once healthy.