The Reds signed Kelly to a minor-league contract Wednesday.
Kelly, 34, has spent the last six seasons pitching for the LG Twins in the Korea Baseball Organization, including this year when he's held a 4.51 ERA and 69:25 K:BB over 113.2 innings. The right-hander last appeared in the majors in 2018. He's been assigned to Triple-A Louisville and will likely join the rotation there.