That's a good question. We have a log jam of starters at the high levels of our system.
You have several minor league free agents like Wil Ledezma, Josh Towers, Mike O'Connor, Odalis Perez, and Bobby Brownlie that will all more than likely want to be starters and pitching at the very least AAA. Brownlie was in our system last year and did well in AA so I doubt he'd accept an assignment back to AA again.
And then you have a slew of young minor leaguers like Tyler Clippard, Marco Estrada, Shairon Martis, Craig Stammen, and possibly Jordan Zimmermann or Collin Balester.
I really don't know how they are going to fit every one in because the AA rotation will likely be full as well (Detwiler, Atilano, VanAllen, Alaniz, Jones).