Heuer announced Tuesday via his personal Instagram account that he underwent an unspecified arm surgery this week.
Until it becomes clear exactly what procedure Heuer underwent, it's difficult to say when he'll be back. If he underwent Tommy John surgery, he'll definitely miss all of the upcoming season as well as a substantial portion of 2023, though a lesser procedure could still give him a chance to return this year. Heuer had looked like one of the top alternatives to presumed closer Rowan Wick, but Wick's job now appears to be comparatively safe. Brad Wieck and Manuel Rodriguez look like Wick's main competition for now.