The D-backs made their first move to fortify the bullpen, agreeing to a trade with the Marlins for left-hander A.J. Puk, a source told MLB.com’s Christina De Nicola on Thursday night. The teams have not confirmed the deal.

The Marlins will receive Arizona’s No. 14 prospect, Deyvison De Los Santos, and No. 30 prospect Andrew Pintar in the trade, per a source.

Puk joins Joe Mantiply as the only lefties in the D-backs’ bullpen.

The 29-year-old opened 2024 in the rotation after an impressive Grapefruit League performance, but the results didn’t translate over four regular-season starts (9.22 ERA) before he landed on the injured list with left shoulder fatigue.

When Puk returned, it was out of the bullpen. He changed his sweeper back into a hard slider and ditched the splitter, helping him become a dominant setup man for closer Tanner Scott.

Puk, who is making $1.8 million in 2024, has two more years of arbitration eligibility before he can become a free agent.

Miami acquired Puk from Oakland for outfielder JJ Bleday at the beginning of 2023 Spring Training. Though Puk trained over that offseason to be a starter in the Majors for the first time with the A’s, he began the season as the Marlins’ closer before losing the role in July.