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May 13: OF Alek Thomas receives a platelet-rich plasma (PRP) injection
Despite initially being close to a return to the D-backs, Thomas has been shut down following his latest treatment after experiencing swelling in his left hamstring stemming from his latest rehab game on May 5. While the team believes that Thomas can build back up from this point, he is “not close” to returning per manager Torey Lovullo and will require a new set of rehab outings prior to rejoining the big league roster.

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10-day/15-day injured list

OF Alek Thomas (strained left hamstring)
Expected return: TBD
Thomas had been scheduled to come off the IL on May 7, but per manager Torey Lovullo, Thomas felt something in his injured left hamstring after playing in a rehab game for Triple-A Reno on May 5. He received a platelet-rich plasma (PRP) injection to alleviate swelling on May 13, and while further treatments are not believed to be necessary, he will play in Minor Leagues before rejoining the Major League roster. Thomas injured his left hamstring when he grounded into a double play in the first inning on March 31 against the Rockies. He stayed in the game but was replaced defensively in the fourth inning, and underwent an MRI on April 1 that showed a strain in the hamstring that was greater than a Grade 1, but not quite a Grade 2. (Last updated: May 13)

SS Geraldo Perdomo (right meniscus tear)
Expected return: Late May
Perdomo underwent surgery on his right meniscus on April 8 and has resumed some baseball activities, taking live at-bats and working in the batting cages May 13. His running has been limited to an anti-gravity treadmill at 50 percent of his body weight. The shortstop exited Arizona's game on April 3 against the Yankees while rounding the bases in extra innings. An MRI on April 6 revealed a tear in his right meniscus. (Last updated: May 13)

RHP: Luis Frías (right shoulder inflammation)
Expected return: TBD
Frías had been optioned to the Minors on April 17, but complained of some shoulder discomfort and an MRI showed inflammation in the shoulder. The D-backs rescinded his option and instead placed him on the 15-day injured list. As of May 13, he was throwing from 100 feet in an attempt to build-up arm strength prior to a return to the mound. (Lasted updated: May 13)

60-day IL

LHP Eduardo Rodriguez (left lat strain)
Expected return: Late May
A recent MRI showed very positive results, per manager Torey Lovullo, and Rodriguez has begun a throwing program, which has seen him throw from 75 feet on May 13. His initial throwing program was paused after he experienced some discomfort in the left lat following an April 9 bullpen session. On April 17, he was moved to the 60-day IL. The southpaw was removed on March 19 against the Cubs in a Cactus League game with left lat tightness after completing his warmup tosses for the second inning. An MRI taken the following day showed a strain, and he was placed on the injured list to open the year. (Last updated: May 13)

LHP Kyle Nelson (thoracic outlet surgery)
Expected return: 2025 Spring Training
Nelson underwent thoracic outlet surgery on May 6. The surgery was performed by Dr. Gregory Pearl, the same doctor who performed a similar procedure on Merrill Kelly in 2020. Nelson is expected to miss the rest of the season. (Last updated: May 7)

RHP Merrill Kelly (right shoulder strain)
Expected return: TBD
Kelly was placed on the injured list on April 23, two days after being scratched from his start in San Francisco. Kelly said he felt something grab in his shoulder while playing catch in the outfield at Oracle Park on April 20. He returned to Phoenix for an MRI. Manager Torey Lovullo said the injury shouldn’t require surgery and that Kelly will undergo re-imaging in the upcoming weeks. He was transferred to the 60-day IL on May 2. (Last updated: May 3)

RHP Drey Jameson (right elbow inflammation)
Expected return: 2025
Jameson underwent Tommy John surgery last September and per manager Torey Lovullo he is expected to miss the entire 2024 season. (Last updated: Feb. 15)

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