Morton (latissimus) threw a bullpen session Monday without any setbacks and is in line to begin a rehabilitation assignment with Triple-A Fresno on Thursday, Jake Kaplan of the Houston Chronicle reports.
Morton is scheduled to pitch two or three innings in his first rehab start for the Grizzlies. The 33-year-old right-hander has posted a 4.06 ERA while striking out a career-high 10.1 batters per nine innings over 10 starts.