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April 21: 1B Triston Casas placed on 10-day IL with left rib strain; C Tyler Heineman recalled from Triple-A Worcester
Casas fouled off a pitch in a 3-1 count and grabbed at the left side of his rib cage in the first inning of Saturday's game against the Pirates, and he was placed on the injured list with a left rib strain on Sunday. To fill Casas’ spot on the active roster, the club recalled Heineman from Worcester.

Casas said he felt something in a swing during the Red Sox's series vs. the Guardians at the beginning of the week, but he felt like he could battle through it. He said it's not an oblique injury, but the details of the exact diagnosis are still unclear until he has an MRI on Monday in Boston.

"I'm in a lot of pain right now," Casas said. "Unfortunately, the last game, in the first at-bat, after that 3-1 swing, I just came up with a lot of pain in my midsection. We're getting the details a little more in depth as we speak."

April 21: 3B Rafael Devers (left knee)
Devers took batting practice at PNC Park on Sunday, and manager Alex Cora said he still expects Devers to play on Tuesday. In fact, Devers approached Cora about potentially playing Sunday, but the Red Sox wanted to stick to the plan to prevent any further risk of setbacks.

Devers underwent an MRI Thursday morning that showed a bone bruise and no structural damage in his left knee, which he tweaked making a play on defense in Tuesday's loss.

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7-DAY INJURED LIST

OF Tyler O'Neill (concussion)
Expected return: April 23 at the earliest
O'Neill was placed on the 7-day IL -- which is specifically for players with concussion-related symptoms -- three days after his head-on collision with Rafael Devers. The move was made retroactive to April 16, which means O'Neill could be back as early as April 23 if his symptoms subside, which manager Alex Cora said was the plan. O'Neill took batting practice at PNC Park on Sunday. The right-handed hitter has played in 15 games with Boston, making 10 starts in right field and four in left field while hitting .313 with a team-leading seven home runs. (Last updated: April 21)

10-DAY/15-DAY INJURED LIST

RHP Triston Casas (left rib strain)
Expected return: TBD
Casas exited the Red Sox's game against the Pirates on Saturday after his first at-bat, during which he felt pain in his midsection after fouling off a 3-1 pitch. He will undergo an MRI in Boston on April 22, at which point the Red Sox will assess his next steps. Casas had one of the best starts offensively for the Red Sox this season, hitting three doubles and six homers with a .857 OPS in 22 games. (Last updated: April 21)

RHP Nick Pivetta (right elbow flexor strain)
Expected return: May
After Pivetta was diagnosed with a flexor strain in his right elbow, and the Red Sox placed the righty on the injured list, retroactive to April 6. Pivetta threw his first bullpen on April 20 at PNC Park, and he's slated to throw an up-and-down bullpen on April 25 in Cleveland then progress to live batting practice if that goes well. Pivetta went 1-1 with a 0.82 ERA in his first two starts this season before being shut down. (Last updated: April 21)

RHP Garrett Whitlock (left oblique strain)
Expected return: Early May
Whitlock suffered the injury during his start on April 16, and had to come out after four innings and 54 pitches. He remained in Boston during the team's series vs. the Pirates, and he played catch on Saturday. Red Sox manager Alex Cora said the club doesn't deem it to be a serious injury and there's confidence he will be back after serving a minimum amount of time on the injured list. The earliest Whitlock is eligible to pitch again is May 1. The righty is off to a strong start with a 1-0 record and a 1.96 ERA in four starts. (Last updated: April 21)

2B Vaughn Grissom (right hamstring strain)
Expected return: Late April/early May
Grissom played second base for the Triple-A WooSox on April 19 and April 20, hitting a combined 3-for-7 with a double over those two games. He was limited to DH in his first three games. Given that Grissom didn't play any Spring Training games, his rehab could be on the lengthier side. The maximum time for a position player on a Minor League rehab assignment is 20 days. (Last updated: April 21)

INF/OF Romy Gonzalez (left wrist sprain)
Expected return: TBD
Gonzalez was placed on the IL on April 13, retroactive to April 11, with a sprained left wrist. An MRI taken on April 17 showed no structural damage.

"Everything came out clean, so now it's about tolerating the pain or whatever he has going on and keep getting treatment," said Red Sox manager Alex Cora. "But as far as like structurally, he's good. (Last updated: April 18)

RHP Bryan Mata (right hamstring strain)
Expected return: May at the earliest
Mata came to camp out of options, meaning he needed to earn a spot in the bullpen to avoid being designated for assignment. Instead, he suffered a hamstring strain early in camp and now needs to get healthy before the club can make a decision on his future. Mata is getting closer, as he is throwing bullpens, according to Red Sox manager Alex Cora. (Last updated: April 17)

RHP Isaiah Campbell (right shoulder impingement)
Expected return: TBD
The reliever was placed on the 15-day injured list on April 12 with a right shoulder impingement. After pitching well in his first five outings with the Red Sox, the big righty was rocked on back-to-back nights on April 10 and 11, giving up eight hits and nine runs (eight earned) in just two innings. (Last updated: April 12)

60-DAY INJURED LIST

SS Trevor Story (dislocated left shoulder)
Expected return: 2025
Story underwent surgery on April 12. According to a statement from the Red Sox, Story "underwent a successful arthroscopic repair of the posterior labrum, with an open reduction and internal fixation of the fracture of the glenoid rim. The procedure was performed by Dr. Neal ElAttrache."

Story won't play again until next season. Story dislocated his shoulder diving for a ball on April 5 in Anaheim. He was transferred from the 10-day IL to the 60-day IL on April 19. (Last updated: April 19)

LHP Chris Murphy (left UCL)
Expected Return: 2025
Murphy, who came up as a starter before being converted into a multi-inning reliever last season, underwent successful reconstruction of the left ulnar collateral ligament (elbow). Dr. Keith Meister performed the surgery at Texas Metroplex Institute for Sports Medicine & Orthopedic Surgery in Arlington. (Last updated: April 10)

RHP Liam Hendriks (right UCL surgery)
Expected return: Late July/early August
After signing with the Red Sox in February, Hendriks said his goal of coming back from Tommy John surgery would be right around the July 30 Trade Deadline. In Hendricks, who is also signed for next season, Boston will get a reliever who has been dominant in the past. It will be interesting to see how he is utilized in a bullpen that also includes Chris Martin and Kenley Jansen, though both of those pitchers have expiring contracts at the end of the season. (Last updated: March 28)

RHP Lucas Giolito (right UCL surgery)
Expected Return: 2025
Giolito was moved to the 60-day injured list on March 24. He underwent surgery to repair his right elbow ulnar collateral ligament on March 12 after two Grapefruit League starts (4 1/3 innings). (Last updated: March 24)

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