Jack Kochanowicz to undergo Tommy John surgery, expected out until second half of 2027

What happened

Angels right-hander Jack Kochanowicz told reporters, including Jeff Fletcher of the Orange County Register, that he will undergo Tommy John surgery. Per that reporting, Kochanowicz is not expected to return until the second half of the 2027 season — a timeline that wipes out the remainder of this year and the first half of the next.

Kochanowicz is already on the 15-day injured list. Per MLB Trade Rumors, he is expected to be transferred to the 60-day IL once the Angels require the roster spot — a when-not-if situation, per the report, though the move had not been formally executed at the time of this reporting.

Why it matters

For a 62-100 ballclub already eliminated from both the AL West division race and the Wild Card race, the immediate competitive cost is limited. The Angels are 19 games back in the division and rank 12th relative to the Wild Card cut line, sitting 22.0 games off that threshold. There is no pennant race to protect here.

What the surgery does cost is developmental runway. Kochanowicz has logged 240 1/3 innings for the Angels over the past three seasons — real big-league experience accumulating on a young arm, and now that accumulation stops for a significant stretch. The Angels were not getting a rotation anchor in the near term, but they were getting innings, and innings from a pitcher still finding his footing carry their own quiet value on a rebuilding roster.

There is one notable silver lining, and MLB Trade Rumors flags it directly: Kochanowicz will collect major-league pay and service time for the remainder of this season. He entered 2026 with his service clock at one year and 12 days. By the end of the year, per the report, that figure will reach 2.012. In the long arithmetic of arbitration eligibility and free agency, that is not nothing — even if the player himself would almost certainly trade every day of it for a healthy elbow.

The numbers

Over 240 1/3 innings across three seasons with the Angels, Kochanowicz has allowed 5.88 earned runs per nine. His strikeout rate sits at 13.4% and his walk rate at 9.7% — neither figure, as MLB Trade Rumors notes plainly, qualifies as encouraging. The strikeout number in particular sits well below the thresholds a starting pitcher typically needs to establish himself at the big-league level.

The one profile element that cuts the other way is his tendency to generate ground balls. Per MLB Trade Rumors, 54.6% of the balls in play he has allowed have been grounders — a rate that represents a legitimate skill, the kind that can suppress hard contact and keep a pitcher functional even when the swing-and-miss numbers are thin. Whether that profile would have developed into something more durable as he accumulated experience is now a question deferred well past the current season.

Where the club stands

The Angels are 62-100 on the season, fifth in the AL West, and by any measure deep into a long rebuild. They carry a two-game losing streak into a home stand that features the Houston Astros on Tuesday, with Walbert Ureña opposing Kai-Wei Teng, and again Wednesday, with Reid Detmers facing Peter Lambert. The Tampa Bay Rays visit Friday, with Sam Aldegheri set to oppose Shane McClanahan.

The rotation, in other words, keeps turning — it just does so without Kochanowicz for the foreseeable future. When the 60-day IL transfer does go through, it will remove him from the 40-man roster count entirely under standard league roster mechanics, giving the organization a modest amount of flexibility to work with as the season winds toward its conclusion.

What we don't know yet

The exact timing of the 60-day IL transfer has not been reported beyond the condition MLB Trade Rumors described — it will happen when the Angels need the roster spot. Any corresponding roster move the club makes at that point has not been reported.

The surgery itself has not been announced by the Angels organization as of this reporting. What exists is Kochanowicz's own disclosure to reporters, including Fletcher of the Orange County Register. Club announcements, if and when they come, may add procedural detail.

The return window in the second half of the 2027 season is the timeline as reported by MLB Trade Rumors. Recoveries from this procedure vary, and no further specificity about the timetable appears in the available reporting.

What to watch

### When does the 60-day IL transfer happen?

Per MLB Trade Rumors, the move is contingent on the Angels needing the roster spot, which makes it a transaction to monitor in the coming days rather than a completed action at the time of this report. When it does go through, it will open a 40-man slot — worth tracking for any corresponding move the club makes in response.

Beyond the administrative details, the longer watch item is simply Kochanowicz's recovery arc. He is a pitcher who accumulated 240 1/3 innings in the majors, carries a ground-ball rate that MLB Trade Rumors identifies as a genuine asset, and now faces the standard long road back from ulnar collateral ligament reconstruction. The Angels have time — more of it than they would prefer, given the circumstances — and so does he.

The second half of 2027 is the target, per the reporting. The rotation that takes the mound this week against Houston and Tampa Bay will do so without him. That is the immediate operational reality. The larger one is that a pitcher who was quietly accumulating big-league innings on a rebuilding team will now be accumulating something else entirely: patience, physical therapy, and service time on the clock — the last of which, at least, keeps ticking in his favor.