Cousins (biceps) was activated from the 10-day injured list Friday and included on Milwaukee's NLDS roster, Will Sammon of The Athletic reports.
President of baseball operations David Stearns said earlier in the week that Cousins was expected to be available against Atlanta, and the right-hander is now officially on the roster. The 27-year-old should fill a high-leverage role for the Brewers after posting a 2.70 ERA, 1.17 WHIP and 44:19 K:BB over 30 innings this season, especially with setup man Devin Williams (hand) sidelined.