CHICAGO -- The Seattle Mariners placed reliever Sergio Romo on the 10-day injured list on Wednesday with right shoulder inflammation.
The move was made retroactive to Tuesday, a day after Romo pitched a scoreless inning at Minnesota in his 800th major league appearance. The 39-year-old right-hander also tossed a scoreless inning against the Twins in his Mariners debut Saturday.
Romo finalized a $2 million, one-year contract with Seattle last month.
Right-hander Matt Koch was promoted from Triple-A Tacoma, and right-hander Casey Sadler was transferred to the 60-day injured list. Sadler is out for the season because of shoulder surgery.
Koch signed a minor league deal with Seattle on March 10. He is 6-6 with a 4.88 ERA and one save in 36 big league games, last appearing in the majors in 2019 with Arizona.