The Marlins activated Simpson (elbow) from the 60-day injured list and optioned him to Triple-A Jacksonville on Tuesday.
Simpson (elbow) is scheduled to pitch Tuesday for Single-A Jupiter, Christina De Nicola of MLB.com reports.
Simpson (elbow) will throw a live bullpen Saturday with Single-A Jupiter, Christina De Nicola of MLB.com reports.
Simpson (elbow) threw a 35-pitch bullpen Tuesday, Christina De Nicola of MLB.com reports.
Simpson (elbow) threw a 20-pitch bullpen session July 9, MLB.com reports.
Simpson (elbow) has started throwing, Christina De Nicola of MLB.com reports.
Simpson will undergo surgery Tuesday to repair the ulnar nerve in his left elbow, Christina De Nicola of MLB.com reports.
The Marlins transferred Simpson (elbow) to the 60-day injured list Saturday.
Simpson (elbow) is expected to throw a bullpen session later this week, MLB.com reports.
Simpson (elbow) will begin a rehab assignment with Low-A Jupiter on Saturday, Jordan McPherson of the Miami Herald reports.