Duffey was recalled from Triple-A Rochester on Thursday, Brandon Warne of ZoneCoverage.com reports.
Duffey has appeared in three games for the Twins this season, accruing a disastrous 13.50 ERA and 2.25 WHIP with four strikeouts across 5.1 innings. He figures to offer assistance out of the Minnesota bullpen during his latest stint in the major leagues.