Pitcher Alex Cobb is on his way up from extended spring training. Cobb didn't break camp because of an oblique injury. He was 8-5 with a 3.03 ERA in 124 2/3 innings last year for the vaunted Charlotte Stone Crabs.
Also, shortstop Shawn O'Malley, though listed as active on Montgomery's roster by Minor League Baseball, remains on the disabled list. (I've also noticed that the MiLB roster still lists Ryan Royster, too.