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Kansas City Royals starting pitcher Angel Zerpa walks back to the dugout after the first inning of a baseball game against the Cleveland Indians Thursday, Sept. 30, 2021, in Kansas City, Mo. Kansas City, Mo. (AP Photo/Charlie Riedel)

The Kansas City Royals added a lefty and subtracted a righty from their bullpen on Friday, recalling Angel Zerpa from Double-A Northwest Arkansas and optioning right-hander Collin Snider to Triple-A Omaha.

The team also announced that outfielder Edward Olivares, who had an outstanding .371/.421/.486 slash line with four doubles and three homers in 15 games before suffering a right quad strain on May 8, will begin a rehab assignment Friday night with Omaha.

Zerpa, 22, made his major league debut as a starter last Sept. 30, allowing two runs (both unearned) in five innings against Cleveland. He had a 4.79 ERA with a .300 opponent batting average, 45 strikeouts and 11 walks over nine starts (41.1 innings) for the Naturals this season. He gives Mike Matheny a lefty relief option, which he has not had since Foster Griffin was sent back to Omaha last Friday. Left-handed relievers Jake Brentz, Amir Garrett and Gabe Speier are all currently on the injured list.

Snider, 26, began his major league career with six straight scoreless outings (5.1 innings) and had stranded 20 of 23 inherited runners this season, but for the most part he struggled during his first stint in the big leagues. He posted a 7.71 ERA with a .321 opponent batting average, 12 strikeouts and 11 walks in 21 innings with the Royals.