Clarke made the Royals' Opening Day roster, Anne Rogers of MLB.com reports.
Clarke signed a one-year contract with the Royals in December, so it's not much of a surprise he's on the roster. The 29-year-old reliever posted a 4.98 ERA, 1.52 WHIP, 39:14 K:BB, 1-3 record and seven holds in 43 appearances for the Diamondbacks last season. With the Royals' bullpen strong at the back end, Clarke should figure to see mostly low-leverage assignments to begin 2022.