The Orioles assigned Zimmermann (biceps) to the rookie-level Florida Complex League on Monday to begin a rehab program.

Zimmermann looks to be ready for game action after being shut down for just over a month with left biceps tendinitis. The rookie southpaw will most likely require at least two rehab outings in the minors to ramp up for his pitch count, making mid-to-late August a reasonable estimate for his return to Baltimore's rotation. Before hitting the injured list, Zimmermann went 4-4 with a 4.83 ERA, 1.47 WHIP and a 53:20 K:BB across 59.2 innings with the Orioles.

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