"We've had solid reports on him," general manager Jon Daniels said. "He's a strike thrower with good life on his fastball."
Rosin pitched 11 innings in four games in the Cactus League this spring, allowing three runs -- two earned -- on 10 hits and two walks with 12 strikeouts. He spent last season at Double-A Reading in the Eastern League and was 9-6 with a 4.33 ERA in 23 starts and three relief appearances.
T.R. Sullivan is a reporter for MLB.com Read his blog, Postcards from Elysian Fields and follow him on Twitter @Sullivan_Ranger. This story was not subject to the approval of Major League Baseball or its clubs.