Brubaker (arm) was reinstated from the 15-day injured list ahead of his start against the Cardinals on Tuesday.
The 28-year-old was previously confirmed as the starter for Tuesday's contest and has now officially been activated from the injured list. Brubaker spent the past couple weeks on the shelf with right arm inflammation and could face some workload limitations given he hasn't seen game action since his last big-league start Sept. 15.