The Angels activated Johnson (hamstring) from the 15-day injured list Wednesday, Jeff Fletcher of The Orange County Register reports.
Johnson landed on the IL back in early April due to a viral infection but was more recently bothered by a hamstring issue. The righty made two rehab starts in the minors, allowing three runs with a 12:1 K:BB over 8.1 innings. Manager Kurt Suzuki said that Johnson will be available out of the bullpen for now. However, he's a candidate to start Sunday's game against the Dodgers, depending on what his usage is between now and then.