Flynn was recalled from Triple-A Omaha on Monday.
Flynn has improved his performance with Omaha as of late -- over his last 10 games, he's posted a 2.84 ERA and struck out 31 batters over 31.2 innings. He'll get a shot to to see if this recent success can translate to the majors; the 27-year-old hasn't appeared in a major-league game during the 2017 campaign.