Angels right-hander Jack Kochanowicz set for Tommy John surgery, sidelined through second half of 2027

The Los Angeles Angels have been dealt another blow on the mound after right-hander Jack Kochanowicz told reporters that he will undergo Tommy John surgery. The club will list him on the 15-day injured list immediately and expects to transfer him to the 60-day injured list as soon as a roster opening is needed, according to reporting associated with Anaheim’s media coverage today. Kochanowicz’s return timeline was described as extending to the second half of the 2027 season, effectively ruling him out for the remainder of the 2026 campaign and the entirety of the early 2027 stretch.

For a team that has to manage both health and innings, the nature of the surgery matters. Tommy John surgery is performed to address injury to the ulnar collateral ligament, and the typical recovery is measured in months rather than weeks. Even without projecting exact dates, the Angels’ next-look starting rotation and long-relief planning both have to account for an extended absence from a single pitcher who, by virtue of being placed on the IL, had been moving through the ordinary rhythms of a season before this latest development.

Kochanowicz’s injury adds to the larger backdrop of how difficult it is for teams to stabilize a rotation across a full calendar. In prior team context, has described rotation improvement as a seasonal priority for the Angels, citing performance struggles that made consistent run prevention a recurring challenge. That context does not assign causation to Kochanowicz’s specific injury, but it frames why a prolonged window without a starting-caliber arm is significant in a race where depth often becomes the difference between patching problems and compounding them.

The Angels also have to consider how the roster mechanics of the injured list change the day-to-day choices for a front office. When a pitcher is moved from the 15-day injured list to the 60-day injured list, it can open up a 40-man roster spot while also making it harder to treat the player as a near-term option. In practical terms, the club’s pitching staff needs a plan that covers innings now, not later, because a June injury with a 2027 timeline rarely leaves room for a midseason workaround.

Kochanowicz is not the only Angels pitcher whose year-to-year plans have been shaped by surgical history and elbow-related wear, a reality reflected in Orange County Register coverage earlier in the 2026 season about another Angels pitcher requiring major elbow surgery. While that earlier situation involves a different player and a separate timeline, it underscores a common theme in MLB roster construction: once the team’s medical picture turns, the organization must respond with both immediate promotions and longer-term development paths.

What to watch next is the way the Angels balance opportunity across the staff. With Kochanowicz out through most of the next season, attention will likely shift to which internal options can handle higher-leverage innings and which pitchers profile as gap or back-end starters while the rotation regroups. The immediate follow-up from the organization should include the timing of the 60-day injured list move and the next publicly described step in Kochanowicz’s rehabilitation plan, since that tends to guide both the club’s expectations and the availability of related bullpen assignments.

Finally, the longer view is the 2027 “second half” target, which is broad by necessity and can change based on healing milestones. The Angels’ next offseason and spring-training evaluations will likely be built around that uncertainty, including how they scout for pitching depth and how they decide whether to carry additional young starters who can cover innings if a late-return timeline shifts further.

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