Mariners Dealt Season-Ending Update During Athletics Series

Jerome Miron-Imagn Images

Mariners Dealt Season-Ending Update During Athletics Series

Originally posted on Athlon Sports | By Miracle Dimwesh | Last updated Sep 5, 2026 11:24 AM ET

Matt Brash’s hopes of returning to the Seattle Mariners this season have officially come to an end.

The Mariners have shut down the right-handed reliever from throwing for eight weeks after an MRI revealed lingering inflammation in his right lat, general manager Justin Hollander announced.

Seattle Times reporter Ryan Divish first reported the update, which closes the door on Brash potentially returning during the final weeks of the regular season.

Brash had been sidelined since June while working his way back from the injury. The Mariners had hoped he could contribute to the bullpen during September, but the latest setback leaves Seattle without one of its most effective relievers.

Matt Brash will be shut down from throwing for eight weeks after MRI revealed more inflammation in his lat. He is obviously done for the season.
— Ryan Divish (@RyanDivish) September 4, 2026

The 28-year-old was dominant when available in 2026, posting a 3-0 record with a 0.54 ERA and 15 strikeouts over 16 2/3 innings in 20 appearances.

However, his season became another frustrating stop-and-start stretch as he dealt with multiple issues involving his right lat and struggled to complete his comeback.

The loss puts additional pressure on Seattle’s remaining late-inning options, particularly closer Andrés Muñoz, as the club continues its series against the Athletics.

Seattle Mariners manager Dan Wilson (6) Matt Krohn-Imagn Images

The timing is especially disappointing for a Mariners team still facing a difficult climb in the AL West. Seattle entered Saturday at 66-76, seven games behind the first-place Houston Astros.

This article first appeared on Athlon Sports and was syndicated with permission.

More must-reads: