Seattle confirmed the injury was a torn left achilles tendon and placed him on the 15-day injured list Friday. The club recalled right-handed reliever Jackson Kowar from the Triple-A Tacoma Rainiers in a corresponding move. Thornton was acquired by the Mariners back in 2023 and has been one of the most dependable bullpen arms for the team since.

Mariners reliever Trent Thornton left the field on a cart in the ninth inning of a 6-0 win over the Rangers and said he would have an MRI on Friday.