We knew Franklin Morales was out due to injury, but the prognosis seems to have worsened as Morales has a bulging disc according to Peter Abraham (and a bunch of other beat writers, but his tweet was the first I saw). There's no timetable on his return, and he had an epidural, according to Sean McAdam.
With Morales and Breslow both out, we know a few things. One: Andrew Miller will see a lot of playing time early on as the lone lefty. I'd also say those of you buying into Jon Heyman's "Cut Aceves to teach him a lesson" argument will be disappointed. The bullpen is supposed to be a place of strength for the club, so cutting into its depth is not going to be an option.