LeBlanc (elbow) hasn't recovered well from Tuesday's bullpen session and may not be able to return this season, Jeff Jones of the Belleville News-Democrat reports.
The veteran left-hander threw off flat ground twice in the days leading up to the bullpen session, but his progression to mound work apparently didn't go well. LeBlanc landed on the injured list Aug. 13 with a left elbow injury, and the setback could mean he's already thrown his last pitch in 2021.