The Reds recalled Busenitz from Triple-A Louisville on Friday.
With Derek Law headed for the 15-day IL due to a right elbow sprain, Busenitz will join the Reds' bullpen. He made his first major-league appearance since 2018 on Sunday, allowing one run on three hits and a walk over 0.2 innings. Busenitz holds a 1.80 ERA and 1.40 WHIP through 15 Triple-A frames, and he shouldn't be expected to see high-leverage usage with Cincy.