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.

Simpson (elbow) will throw a bullpen session Saturday, Jordan McPherson of the Miami Herald reports.

The Marlins placed Simpson on the 15-day injured list Thursday with left elbow ulnar neuritis.

Manager Skip Schumaker said Sunday that Simpson is dealing with left elbow discomfort that's similar to nerve irritation, Christina De Nicola of MLB.com reports.

Simpson was optioned to Triple-A Jacksonville on Sunday, Jordan McPherson of the Miami Heraldreports.

Simpson was recalled Tuesday from Triple-A Jacksonville, Jordan McPherson of the Miami Herald reports.

Simpson (shoulder) struck out two and allowed no hits and one walk over one inning in his lone appearance since being reinstated from Triple-A Jacksonville's 7-day injured list Saturday.