Marlins Calling Up Jack Ralston From AAA for MLB Debut

Jack Ralston is reportedly on his way to the majors. Per Craig Mish, the Marlins are calling up the relief pitcher from AAA, and whenever he takes the mound it will mark his big-league debut.

Mish noted that Marlins manager Clayton McCullough was expected to address the move during a pregame availability at 1 PM, so additional context on the roster mechanics — and what prompted the callup — may follow from that session.

What we don't know yet

The report does not specify which corresponding roster move clears space for Ralston, nor does it detail his role or how quickly he might appear in a game. The Marlins have made several roster adjustments over the past few days, including moves announced via the club's official account, though specifics on those transactions were not included in earlier reporting. Edward Cabrera's bullpen availability has also been in flux recently, per prior Posterior coverage.

For now, Ralston's callup is a report from Mish, not a club announcement — the pregame session with McCullough is the next place to watch for anything more formal.