Veteran first baseman Carlos Santana's return to the Arizona Diamondbacks has hit another snag. The 40-year-old, who is the oldest active position player in Major League Baseball, experienced a setback while rehabbing a right groin strain that has kept him on the injured list since April 5.

Santana was playing for Triple-A Reno over the weekend when he felt a twinge in the same area of the injury on Saturday. Diamondbacks manager Torey Lovullo shared the news Monday ahead of Arizona's game against the Texas Rangers, noting that Santana has returned to Arizona for further evaluation.

"Kind of a bummer," Lovullo said. "I know he's been working really, really hard to come back. He hit a home run a couple of days ago, so I think his swing was coming around."

The injury occurred during Arizona's April 5 home game against Atlanta. Santana left in the second inning after singling—a rare bright spot in what had been a tough start to the season. Through eight games, he managed just two hits in 24 at-bats, posting a .083 batting average with no home runs or RBIs.

Santana signed with the Diamondbacks as a free agent in early February after splitting the 2025 season between Cleveland and the Chicago Cubs. He hit a combined .219 with 11 home runs and 54 RBIs last year, hoping to bring veteran stability to Arizona's lineup.

This injury is just the fifth time in Santana's 17-year career that he has landed on the injured list. It will likely result in his longest absence since his rookie season with Cleveland in 2010, when he missed the final two months with a sprained left knee. For a player known for his durability, this setback is particularly frustrating—both for him and for a Diamondbacks team that could use his experience down the stretch.