Diamondbacks place RHP Paul Sewald (neck) on 15-day IL

The Arizona Diamondbacks placed right-handed reliever Paul Sewald on the 15-day injured list Sunday because of discomfort on the left side of his neck.

The move was retroactive to Thursday. In other moves, the Diamondbacks reinstated catcher Gabriel Moreno (strained left adductor) from the 10-day IL, recalled rookie left-hander Blake Walston from Triple-A Reno and designated righty Dylan Floro for assignment.

Sewald, 34, last pitched Sept. 8, allowing two hits and one run in one inning in a 12-6 road win against the Houston Astros . He is 1-2 with 16 saves, a 4.31 ERA, 10 walks and 43 strikeouts in 39⅔ innings over 42 relief appearances.

He began the season on the IL because of a strained left oblique.

Sewald is a career 20-25 with 84 saves and a 4.09 ERA in 359 relief appearances for the New York Mets (2017-20), Seattle Mariners (2021-23) and Diamondbacks.

Moreno, 24, left the Aug. 5 game against the host Cleveland Guardians in the second inning after running out a ground-ball single. He went on the 10-day IL on Aug. 6 after an MRI showed a strained left adductor muscle.

Moreno is batting .262 with five home runs and 41 RBIs in 86 games this season. He is a career .279 hitter with 13 homers and 98 RBIs in 222 games with the Toronto Blue Jays (2022) and Diamondbacks (2023-present).

Walston, 23, is 0-0 with a 2.84 ERA, 9 walks and 11 strikeouts in 12⅔ innings over three games (two starts) since making his major league debut May 1. He was 3-2 with a 4.85 ERA, 31 walks and 68 strikeouts in 65 innings over 14 games (13 starts) at Triple-A.

Floro, 33, was 3-1 with a 9.37 ERA, 4 walks and 8 strikeouts in 16⅓ innings over 15 relief appearances for Arizona, which acquired him in a July 30 trade with the Washington Nationals for first baseman Andres Chaparro .

Floro was 3-3 with a 2.06 ERA in 52⅓ innings over 51 relief appearances this season for the Nationals. He is a career 32-26 with 32 saves and a 3.49 ERA in 396 relief appearances for eight different teams since 2016.