The Phillies optioned Johnson to Triple-A Lehigh Valley on Thursday.
Johnson gave up two runs on five hits with five strikeouts and six walks over seven Grapefruit League appearances and won't begin the season in the majors. He made 10 appearances for the Phillies last year and had a 4.26 ERA, 1.18 WHIP and 17:4 K:BB across 12.2 innings.