Speier was added to the Royals' 30-man roster Thursday, Jeffrey Flanagan of MLB.com reports.
Speier was originally expected to open the season in the minors before a spot opened up for him in Kansas City's bullpen thanks to expanded rosters. The lefty spent most of the 2019 season with Triple-A Omaha, posting a 5.63 ERA and 1.45 WHIP across 40 innings. He also made nine big-league appearances, allowing six runs while posting a 10:6 K:BB in 7.1 innings.