"Maybe [reliever Ryan] Madson," Yost said. "To come in, you look at it as a flyer, and then you watch and he's got his fastball back up to 91, 92, he's always had that devastating change. He's a pretty interesting guy."
Madson, the 34-year-old veteran of championship Phillies teams who hasn't pitched in the Major Leagues since 2011 because of various arm ailments, signed a Minor League deal with the Royals on Jan. 4. He entered Friday night's game against the Padres with a 2.25 ERA in four innings over four appearances this spring, and added a quick 1-2-3 inning and now has a 1.80 ERA. His fastball hit 93 mph on Friday.
Madson still projects to be a longshot to make a loaded bullpen out of Spring Training but could represent valuable depth while honing his stuff in Triple-A once the season starts.
"He hasn't thrown in a couple of years," Yost said. "But you could see where if he stays healthy, he could help us."
Doug Miller is a reporter for MLB.com. Follow him on Twitter @DougMillerMLB. This story was not subject to the approval of Major League Baseball or its clubs.