The Athletics placed right-hander Luis Severino on the 15-day injured list Saturday with a left oblique strain.
The move is retroactive to Wednesday.
Signed to a three-year, $67 million contract, Severino (6-11, 4.82 ERA) was in the midst of overcoming a disastrous start to the season by winning each of his last four starts.
Severino, 31, is one season removed from posting an 11-7 record with a 3.91 ERA in 31 starts with the New York Mets.
A two-time All-Star with the New York Yankees (2017, 2018), Severino is 71-55 with a 3.94 ERA in 196 games (180 starts) with the Yankees (2015-19, 2021-23), Mets (2024) and Athletics.
Also on Saturday, the Athletics recalled left-hander Hogan Harris from Triple-A Las Vegas.
Harris, 28, is 1-1 with a 4.35 ERA in 30 relief appearances with the Athletics this season.
–Field Level Media
