The Twins needed another starter after Tuesday's game against the Dodgers was postponed because of inclement weather, giving them six games in five days. So the Twins needed to either recall a pitcher to start in Game 2 of the doubleheader or one to start Sunday -- unless Wednesday's starter, Kyle Gibson, goes on short rest on Sunday.
With the ability to add a 26th player for the second game of the doubleheader, the Twins opted to recall Johnson for Game 2. Right-hander Mike Pelfrey is slated to start Game 1.
Johnson, 29, was acquired in a trade with the Pirates in exchange for reliever Duke Welker in November. Welker was originally acquired from the Pirates as part of the trade that sent Justin Morneau to Pittsburgh last August.
The 6-foot-4 left-hander has a career 4.23 ERA in 940 1/3 innings in the Minor Leagues. He also posted a 6.10 ERA in 10 1/3 innings last year with the Pirates over four appearances, including a start.