Zimmerman (neck) will throw a simulated game against the Red Sox on Sunday and is expected to throw around 30 pitches, reports the Detroit Free Press.

EDGE Analysis

Zimm tossed a bullpen on Thursday, but is frustrated by the slow pace of his rehab. "I'd like to go a little quicker, but that's the program they got me on, and I'm just taking it one day at a time and just trying to get a little bit better everyday and come back and help this team win some ball games," said the hurler. Zimmerman mixed in some some sliders and curveballs into the fastball-heavy session in the pen. He says he's feeling better than he was when he returned from the DL the first time, so Sunday's test is crucial for the Tigers to assess Zimm's availability in September.