Johnson (arm) will come off the 7-day disabled list and start Thursday for Triple-A Iowa.
Johnson was deactivated for a week after being struck by a line drive in his April 11 start, but his setback did not turn into a long-term issue. With Johnson now at the Triple-A level and owning a 2.48 career minor league ERA, he will have a chance to make his big league debut at some point this season.