Johnson was recalled from Triple-A Lehigh Valley and will start Sunday against the Marlins.
Johnson will make his MLB debut Sunday in Miami, and a strong showing could give him a longer look as Philadelphia's No. 5 starter down the stretch. The 26-year-old was acquired from the Orioles ahead of the summer trade deadline and was dominant in three outings for Lehigh Valley with a 0.56 ERA, 0.69 WHIP and 13:6 K:BB across 16 innings.