Cousins (biceps) reported to Triple-A Nashville for a rehab appearance Sunday, Tom Haudricourt of the Milwaukee Journal Sentinel reports.
Cousins is then expected to rejoin the Brewers and continue to face live hitters in hopes of being activated ahead of the NLDS, which begins Friday. The 27-year-old has a 2.70 ERA, 1.17 WHIP and 44:19 K:BB over 30 innings this season, and he could play a significant role in the playoffs with setup man Devin Williams out indefinitely with a fractured hand.