Jokisch, 26, has appeared in four Major League games (one start). He is 48-41 with a 3.62 ERA in seven Minor League seasons, working mostly as a starter.
McGough, a former fifth-round pick by the Dodgers, has a 9.45 ERA in six career relief appearances.
Cash Kruth is a reporter for MLB.com. Follow him on Twitter at @cashkruth. This story was not subject to the approval of Major League Baseball or its clubs.