What was supposed to be a season of renewed health and depth has become Houston’s worst injury crisis in recent memory.
Just two weeks in, the Astros have a handful of players on the injured list including Peña, Imai, Hunter Brown, Cristian Javier, Brandon Walter, Ronel Blanco, Hayden Wesneski, Josh Hader, and Jake Meyers.
Here is the complete sports medicine breakdown of each key injury, what it means clinically, and when these players might return.
Hunter Brown | Grade 2 Right Shoulder Strain
The injury that started it all.
Brown was diagnosed with a Grade 2 right shoulder strain and will refrain from throwing for a few weeks, with reevaluation in two weeks.
The critical positive: the issue is muscular with no evidence of ligament damage.
A Grade 2 strain means partial disruption of muscle or tendon fibers.
Clinically, treatment follows a phased approach: an initial 2 to 3 week no-throw shutdown, followed by progressive throwing reintroduction, a long toss program, and then bullpen work before return to competition.
Even without setbacks, he will need to build back up after the shutdown period, meaning a lengthy absence.
Return timeline: Late May to early June, best case.
Cristian Javier | Grade 2 Right Shoulder Strain
A deeply concerning parallel to Brown. The Astros placed Javier on the 15-day IL with a Grade 2 strain in his right shoulder, and he is likely to spend an extended period on the injured list.
What makes this particularly worrying from a sports medicine standpoint is his surgical history. Javier had just recovered from Tommy John surgery that kept him on the shelf for over a season.
Two Grade 2 shoulder strains on the same pitching staff within days of each other raises legitimate questions about arm care, workload progression, and spring training ramp-up protocols.
For a post-Tommy John pitcher, any shoulder complaint must also be evaluated with the UCL in mind, as altered mechanics post-surgery can redistribute stress to adjacent structures.
Return timeline: Mid-to-late May, minimum. Structural concerns could extend that significantly.
Jake Meyers | Grade 2 Oblique Strain
Meyers landed on the IL with a Grade 2 oblique strain after feeling his back tighten during a check-swing in the second inning of the same Rockies game that ended Javier’s day.
A Grade 2 oblique strain involves partial tearing of the internal or external oblique muscles along the lateral trunk wall, structures that are absolutely critical for rotational athletes.
The mechanism here is textbook: the sudden deceleration force of a check-swing generates significant eccentric load on the oblique musculature.
Treatment involves rest, anti-inflammatory management, and progressive core stabilization before any bat speed work resumes.
Returning too soon from an oblique strain is one of the most common reasons players end up re-injured within the same season.
Return timeline: 4 to 6 weeks, targeting mid-to-late May.
Jeremy Peña | Grade 1 Right Hamstring Strain
What initially presented as posterior knee tightness turned out to be something else entirely.
Peña has a Grade 1 right hamstring strain and was placed on the 10-day IL.
He left Saturday’s loss to the Mariners in the fourth inning, underwent imaging Sunday, and a mild strain was discovered.
A Grade 1 hamstring strain is the least severe classification, involving microtearing of muscle fibers without significant structural disruption.
This is good news.
The reason the posterior knee initially felt tight is anatomically logical: the hamstring muscle group crosses the knee joint, and proximal or mid-belly strains often refer discomfort distally toward the popliteal fossa.
Clinically, Grade 1 hamstring strains respond well to relative rest, soft tissue therapy, and a graduated return-to-running protocol.
The biggest risk factor is premature return, which is how Grade 1 injuries escalate into Grade 2 tears.
The team initially announced the issue as right posterior knee tightness, though further testing found the hamstring strain.
This is worth noting: Peña played through this twice before reporting it. That delayed disclosure likely did not help.
Return timeline: 2 to 3 weeks, potentially returning in late April.
Tatsuya Imai | Right Arm Fatigue
The most ambiguous diagnosis on the list.
Imai was placed on the 15-day IL due to arm fatigue after traveling back to Houston following Friday’s loss to the Mariners, where he recorded just one out and threw 37 pitches.
From a sports medicine perspective, “arm fatigue” in a pitcher must always be taken seriously.
It can represent benign muscular fatigue from workload adjustment, or it can be an early warning signal of more significant soft tissue stress before structural damage appears on imaging.
Imai is navigating a particularly difficult transition: starters in Nippon Professional Baseball pitch once per week, compared to the MLB’s every-five-days schedule.
That represents a meaningful increase in throwing frequency and accumulated workload for a pitcher whose connective tissue is not yet conditioned to this volume.
No structural diagnosis has been confirmed. Until imaging and examination results are disclosed, the severity remains genuinely unknown.
Return timeline: Unknown pending further evaluation. Optimistic case is 2 to 3 weeks; more serious findings could extend this significantly.
Josh Hader | Left Biceps Tendinitis (Rehab Progress)
Here is some encouraging news in an otherwise bleak injury report.
Hader began the year on the IL with biceps tendinitis, a diagnosis that followed his left shoulder capsule strain that ended his 2025 season prematurely. The clinical picture here involves two layered upper extremity injuries in consecutive seasons, which is a pattern that warrants careful management.
Biceps tendinitis in pitchers often reflects shoulder workload imbalance, particularly following a prior shoulder capsule injury where compensatory mechanics can overload the long head of the biceps tendon.
Treatment centers on reducing inflammation, addressing underlying shoulder mobility deficits, and a gradual throwing buildup.
The good news: GM Dana Brown said Hader would begin facing hitters by mid-April, and that scenario still appears very much in play with bullpen sessions progressing well.
The Astros believe he could face live hitters soon,and would likely need a rehab assignment before rejoining the active roster, making the start of May the earliest realistic return.
Return timeline: Early-to-mid May, assuming no setbacks facing hitters.
The Clinical Bottom Line
Within the first 14 games of the season, three-fifths of the Houston starting rotation dealt with significant injury concerns, with pitchers being sent back to Houston for evaluation in rapid succession.
From a sports medicine standpoint, the concentration of upper extremity injuries in the pitching staff, particularly two identical Grade 2 shoulder strain diagnoses within days of each other, warrants a broader review of throwing program design, spring training workload management, and mechanical screening.
The one genuine bright spot is Hader trending toward a return.
Getting their elite closer back in early May would at least stabilize the back end of the bullpen while the rotation slowly rebuilds.
