"It's not what you want to see," Yankees manager Joe Girardi said. "He threw the ball pretty well for us in Spring Training, and it's not what you want to see. It's still what we're still dealing with."
Rodriguez, 25, made his Major League debut with the Royals last year, appearing in two games and pitching two scoreless innings.
"It's a risk that players take when they don't know what they put in their body, or they take something that they know is illegal and think they're going to get away with it," Girardi said. "I don't understand it, but it's the world we live in."
Bryan Hoch is a reporter for MLB.com. Follow him on Twitter @bryanhoch and read his MLBlog, Bombers Beat. This story was not subject to the approval of Major League Baseball or its clubs.