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.

EDGE Analysis

Simpson hasn't pitched since Feb. 27, and Schumaker said the club is being cautious since the left-hander "still feels it a little bit." Given the length of the layoff, the 26-year-old will likely need to ramp things up soon to have a chance of being ready by Opening Day.

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

EDGE Analysis

The left-hander was called up by Miami on Tuesday but didn't make his MLB debut during his time with the team. Simpson will return to Jacksonville, where he has a 4.50 ERA over 32 innings this year.

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

EDGE Analysis

Simpson has struck out 62 batters in 36.1 innings this season in the minors, but all of those whiffs have come alongside a 4.71 ERA and 1.54 WHIP. The 26-year-old left-hander will be making his major-league debut whenever he gets into a game for the Marlins.

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.

EDGE Analysis

Simpson was on the IL for nearly three months due to a left shoulder injury. The 25-year-old reliever has yet to make his MLB debut, but he occupies a spot on the Marlins' 40-man roster and could be in the mix for a late-season call-up.

Simpson (shoulder) began a rehab assignment July 9 at Single-A Jupiter and retired two hitters while allowing three earned runs on two hits and one walk. He struck out one batter.

EDGE Analysis

Simpson was placed on Triple-A Jacksonville's 7-day injured list May 9 with a left shoulder impingement, but now that he's rehabbing in the lower levels in the minors, it likely won't be long before he's activated. In 11 innings with the Triple-A club this season, Simpson has posted a 6.55 ERA and 1.91 WHIP while striking out 16 hitters.