The Rangers transferred Leiter (ankle) from the 15-day injured list to the 60-day IL on Sunday.
The right-hander has been on the shelf since mid-June, so the move to the 60-day IL isn't expected to affect his return timeline. Leiter threw 33 pitches over two innings of live batting practice Saturday and is set to throw a bullpen session Monday, per Evan Grant of The Dallas Morning News. According to Jeff Wilson of AllDLLS.com, if Monday's side session goes well, Leiter will begin a rehab assignment at Double-A Frisco on Thursday and will be slated to throw 2-to-3 innings.