Zac Gallen placed on 15-day IL with right elbow inflammation, backdated to July 9th

Zac Gallen is heading to the 15-day injured list with right elbow inflammation, the Arizona Diamondbacks announced, with the move backdated to July 9th. Lefty Mitch Bratt has been recalled in Gallen's place.

What happened

The IL placement came after Gallen had already been scratched from his next scheduled start — a development first relayed by Nick Piecoro of the Arizona Republic. Piecoro had reported that the injury could require an IL stint, and the club's subsequent announcement made it so, with the 15-day clock running retroactively from July 9th. The Diamondbacks also announced that Bratt has been recalled to fill the vacancy in the rotation.

Under general league rules, pitchers are eligible for the 15-day injured list rather than the 10-day version available to position players, meaning Gallen cannot return before that minimum window has elapsed. The retroactive start date gives Arizona a modest head start on that clock.

Why it matters

Gallen has been among the Diamondbacks' most dependable starters across his career in Arizona, which makes 2026 a particularly disorienting chapter. The elbow inflammation adds a new layer of uncertainty to a season that was already generating uncomfortable questions — and the club now must manage his absence while sorting out what the rotation looks like beyond Sunday.

Whether the inflammation explains any portion of the performance decline this year is not something the available reporting addresses, and the desk will not speculate. What is clear is that Arizona loses a rotation arm at a moment when the standings offer little room to absorb disruption.

The numbers

Gallen has posted a 6.34 ERA across 19 starts and 98 innings this season, per MLB Trade Rumors. Those are the headline figures, but the underlying numbers are, if anything, more pointed. His xERA sits at 6.49, which ranks in the 2nd percentile league-wide — meaning the ERA is not a case of bad luck obscuring a functional pitcher. The peripherals are largely in agreement with the surface results.

His xFIP and SIERA are both near 5.00, per MLB Trade Rumors, which suggests some regression toward the ERA is built in — though regression toward 5.00 is not exactly a rallying cry for the rotation. The more striking figure may be the strikeout rate: Gallen is punching out batters at a 13.9% clip, a career low. In each of his previous seven MLB seasons, that number had never dipped below 21%. MLB Trade Rumors notes that his top three pitches have been hit hard this year even as his velocity has held at its normal level — a combination that tends to raise more questions than it answers about what has changed.

Ninety-eight innings is a meaningful sample. This is not a small-number anomaly.

Where the club stands

The Diamondbacks enter Sunday at 86-76 (.531), sitting third in the NL West, 14 games back in the division. Arizona has been eliminated from the division race. On the Wild Card side, the club ranks fourth and sits 2.0 games relative to the cut line — and has also been eliminated from the Wild Card race. The team arrives at Sunday on a two-game losing skid.

The next game on the schedule is Sunday at UNIQLO Field at Dodger Stadium, where Mitch Bratt is listed as the probable starter against Emmet Sheehan. It is not a low-stakes audition venue.

Is Bratt ready for a Dodger Stadium start?

That is the question Arizona's coaching staff is presumably sitting with right now. Bratt is listed as the probable starter for Sunday against Los Angeles, and the Diamondbacks announced his recall. What the available reporting does not address is his recent workload, his minor-league numbers, or how long the club envisions him in the rotation. The desk does not fill those gaps.

What can be said is that Bratt is a lefty stepping into a right-hander's spot, facing a Dodgers lineup at home, in a game that carries real weight for a team navigating a difficult stretch. The assignment is not a soft landing.

What we don't know yet

The reporting does not specify a timetable for Gallen's return beyond the 15-day minimum. The nature of elbow inflammation can vary considerably, and Piecoro's initial report noted only that an IL stint was possible — the club's announcement confirmed the placement without offering a recovery window. Whether the inflammation is connected in any way to the performance decline this season is not addressed in the available material.

It is also unclear how Arizona plans to structure the rotation beyond Sunday. If Gallen's absence extends past the minimum, the club will need to make additional decisions about coverage — but those decisions, if they have been made, have not been reported.

What to watch

The most immediate thing to monitor is Bratt's Sunday start and how the Diamondbacks manage the rotation behind him. Beyond that, any update on Gallen's status — whether the club provides a clearer timetable or whether the IL stint is extended — will be the signal worth tracking.

Given the gap between his current numbers and his career baseline, and the elbow issue now layered on top, the question of what Arizona's rotation looks like as the season progresses is worth keeping in view. The 15-day clock, running from July 9th, sets the earliest possible return date. Whether Gallen is ready at that point, or whether the club opts for additional time, remains to be seen.