Matt Brash Shut Down for Season After MRI Shows More Lat Inflammation

Matt Brash's 2026 season is over. The Seattle Mariners announced the right-hander has been shut down after an MRI revealed additional lat inflammation, per Luke Olson at MLB.com.

The finding adds a discouraging layer to what had already been a difficult stretch. An earlier report this week noted that a prior MRI had shown no structural damage but indicated Brash would not throw for eight weeks — a window that, at this point in the calendar, effectively closes the door on any return.

What remains unconfirmed

The source does not specify a precise IL designation or detail any next steps beyond the shutdown. No updated timetable for a return to throwing appears in this report beyond what was previously noted.

The broader Seattle picture

Brash's absence lands in an already unsettled Mariners pitching situation. Earlier this week, starter Emerson Hancock left with an adductor strain over the weekend, opening a rotation spot. The club has also been active on the roster front in recent days, with multiple moves involving the outfield.

For Seattle, Brash's shutdown is the kind of update that doesn't require elaboration — the season column next to his name now reads closed.