Boesch was reassigned to minor league camp Monday.
Boesch underwent wrist surgery last week and is expected to miss 2-to-3 months, so his exclusion from the Opening Day roster comes as no surprise. The soon-to-be-31-year-old likely didn't stand much of a chance of making the roster anyway, and the injury further impedes any opportunity he had to work his way back to the majors later in the year.