The Phillies recalled Johnson from Triple-A Lehigh Valley on Thursday.
With Brad Keller surely out for the season after being diagnosed with a UCL tear, Johnson will come up from the minors to replenish the Phillies' bullpen depth. The 27-year-old owns an 8.20 ERA and 1.71 WHIP over 26.1 innings in his MLB career and hasn't been much better in the big leagues this year, conceding nine earned runs in just 11.1 frames. He'll likely be limited to a low-leverage relief role.