Graterol had his contract selected by the Twins on Sunday.
Graterol spent most of the season with Double-A Pensacola, working primarily as a starter and racking up a 1.78 ERA with 49 strikeouts and 21 walks across 50.2 innings. He most recently pitched out of the bullpen with Triple-A Rochester, a role he's likely to fill with the Twins. Known for the velocity on his fastball, Graterol could immediately rack up a notable amount of strikeouts at the major-league level.