The Diamondbacks are bringing back right-hander Zac Gallen on a one-year deal, reuniting with their erstwhile ace after a long winter in which he dangled on the free-agent market.
Gallen and the club are in agreement on a one-year deal worth $22.025 million, pending a physical, a source said. That is the exact amount of the qualifying offer Gallen declined in November.
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Wary of how their experience with a late-signing Jordan Montgomery worked out two years ago, the Diamondbacks told Gallen’s camp it was imposing a deadline to get a deal done, sources said. The team said it would not consider signing him beyond this weekend, a source said.
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Diamondbacks get ready for spring training at Salt River Fields
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Diamondbacks get ready for spring training at Salt River Fields
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks catcher Gavin Logan during spring training workouts at Salt River Fields on Feb. 13, 2026, Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks shortstop Geraldo Perdomo (2) during spring training workouts at Salt River Fields on Feb. 13, 2026, Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks second baseman Ketel Marte (4) during spring training workouts at Salt River Fields on Feb. 13, 2026, Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks Carlos Santana during spring training workouts at Salt River Fields on Feb. 13, 2026, Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks Lourdes Gurriel Jr. during spring training workouts at Salt River Fields on Feb. 13, 2026, Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks catcher James McCann (8) takes infield practice during spring training workouts at Salt River Fields on Feb. 13, 2026, Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks catcher Gabriel Moreno (14) during spring training workouts at Salt River Fields on Feb. 13, 2026, Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks catcher James McCann (8) talks to pitcher Merrill Kelly during spring training workouts at Salt River Fields on Feb. 13, 2026, Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks pitcher Merrill Kelly during spring training workouts at Salt River Fields on Feb. 13, 2026, Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks pitcher Merrill Kelly during spring training workouts at Salt River Fields on Feb. 13, 2026, Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks pitcher Merrill Kelly during spring training workouts at Salt River Fields on Feb. 13, 2026, Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks pitcher Merrill Kelly during spring training workouts at Salt River Fields on Feb. 13, 2026, in Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks Jordan Lawlar during spring training workouts at Salt River Fields on Feb. 13, 2026, in Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks outfielder Druw Jones during spring training workouts at Salt River Fields on Feb. 13, 2026, in Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks Lourdes Gurriel Jr. during spring training workouts at Salt River Fields on Feb. 13, 2026, in Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks assistant general manager Jeremy Bleich (left) during spring training workouts at Salt River Fields on Feb. 13, 2026, in Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks pitcher Brandon Pfaadt (32) during spring training workouts at Salt River Fields on Feb. 13, 2026, in Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks outfielder Druw Jones reacts during spring training workouts at Salt River Fields on Feb. 13, 2026, in Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks pitcher Brandon Pfaadt (32) during spring training workouts at Salt River Fields on Feb. 13, 2026, in Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks catcher James McCann (8) talks to pitcher Brandon Pfaadt (32) during spring training workouts at Salt River Fields on Feb. 13, 2026, in Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks second baseman Ketel Marte (4) during spring training workouts at Salt River Fields on Feb. 13, 2026, in Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks Carlos Santana during spring training workouts at Salt River Fields on Feb. 13, 2026, in Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks Alek Thomas (5) during spring training workouts at Salt River Fields on Feb. 13, 2026, in Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks catcher Gabriel Moreno (14) takes infield practice during spring training workouts at Salt River Fields on Feb. 13, 2026, in Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks Lourdes Gurriel Jr. (right) during spring training workouts at Salt River Fields on Feb. 13, 2026, in Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks catchers James McCann and Gabriel Moreno (right) during spring training workouts at Salt River Fields on Feb. 13, 2026 in Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks catcher Gabriel Moreno (14) throws a football during spring training workouts at Salt River Fields on Feb. 13, 2026, in Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks manager Torey Lovullo (17) during spring training workouts at Salt River Fields on Feb. 13, 2026, in Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks manager Torey Lovullo (17) during spring training workouts at Salt River Fields on Feb. 13, 2026, in Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks catcher James McCann (8) talks to pitcher Merrill Kelly during spring training workouts at Salt River Fields on Feb. 13, 2026, in Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks pitcher Merrill Kelly during spring training workouts at Salt River Fields on Feb. 13, 2026, in Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks pitcher Tommy Henry during spring training workouts at Salt River Fields on Feb. 13, 2026, in Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks pitcher Tommy Henry during spring training workouts at Salt River Fields on Feb. 13, 2026, in Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks pitcher Cristian Mena during spring training workouts at Salt River Fields on Feb. 13, 2026, in Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks Nolan Arenado during spring training workouts at Salt River Fields on Feb. 13, 2026, in Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks shortstop Geraldo Perdomo (2) during spring training workouts at Salt River Fields on Feb. 13, 2026, in Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks Lourdes Gurriel Jr. during spring training workouts at Salt River Fields on Feb. 13, 2026, in Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks Lourdes Gurriel Jr. during spring training workouts at Salt River Fields on Feb. 13, 2026, in Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks manager Torey Lovullo (17) during spring training workouts at Salt River Fields on Feb. 13, 2026, in Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks manager Torey Lovullo (17) during spring training workouts at Salt River Fields on Feb. 13, 2026, in Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks Tim Tawa during spring training workouts at Salt River Fields on Feb. 13, 2026, in Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks pitcher Brandon Pfaadt (32) during spring training workouts at Salt River Fields on Feb. 13, 2026, in Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks pitcher Brandon Pfaadt (32) during spring training workouts at Salt River Fields on Feb. 13, 2026, in Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks pitcher Kohl Drake during spring training workouts at Salt River Fields on Feb. 13, 2026, in Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks second baseman Ketel Marte (4) during spring training workouts at Salt River Fields on Feb. 13, 2026, in Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks Carlos Santana during spring training workouts at Salt River Fields on Feb. 13, 2026, in Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks Alek Thomas (5) during spring training workouts at Salt River Fields on Feb. 13, 2026, in Scottsdale.
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Diamondbacks get ready for spring training at Salt River Fields
Arizona Diamondbacks Jordan Lawlar catches a fly ball during spring training workouts at Salt River Fields on Feb. 13, 2026, in Scottsdale.
The sides did not appear to be close to a deal as recently as 24 hours ago, but a source suggested that the looming deadline spurred the agreement.
Gallen has spent almost the entirety of his major league career with the Diamondbacks.
Gallen turned in an up-and-down 2025 season, and though he finished the year with a strong final two months, it seems those inconsistencies might have been enough to deter clubs on the free-agent market, especially considering a team would have had to part with a draft pick to sign him.
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That is not quite the case with the Diamondbacks, though by signing Gallen they are abandoning the notion of recouping a pick were he to have landed elsewhere.
Gallen, 30, owns a 3.58 ERA in 176 career starts, 169 of which have come with the Diamondbacks.
Gallen has said on several occasions over the years that he would love to remain in Arizona, where he lives year-round. He developed an affinity for the organization and the state in part because of the club’s World Series run in 2023.
The signing gives the Diamondbacks additional starter depth and seemingly will push someone into a bullpen role, assuming the club sticks with a five-man rotation.
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As it stands, the Diamondbacks’ rotation options consist of Gallen and fellow right-handers Merrill Kelly, Ryne Nelson, Brandon Pfaadt and Michael Soroka and lefty Eduardo Rodriguez.
The club signed Soroka in December with the expectation that he would be a starter, but he appears to be the most likely pitcher to be the odd man out.
(This story has been updated to add new information.)
This article originally appeared on Arizona Republic: Diamondbacks, Zac Gallen reuniting on 1-year deal, per sources