The Boston Red Sox selected the contract of right-hander Frank German from Triple-A Worcester on Saturday.
To make room on the active roster, the team designated veteran catcher Kevin Plawecki for assignment.
German, who turns 25 next week, is 5-2 with a 2.72 ERA in 43 relief appearances this season between Worcester and Double-A Portland. He has seven saves and 64 strikeouts in 49 2/3 innings.
Plawecki, 31, batted .21