Zastryzny (elbow) began a rehab assignment with Triple-A Nashville on Friday, striking out a batter while allowing two walks and one hit over a scoreless inning in his first appearance.
Zastryzny may require another appearance or two in the minors before the Brewers bring him back from the 15-day injured list. Before being deactivated July 26 due to left elbow tendinitis, Zastryzny made nine appearances for the Brewers and posted a 1.17 ERA, 0.65 WHIP and 5:1 K:BB across 7.2 innings.