The Phillies optioned Johnson to Triple-A Lehigh Valley on Monday.
Johnson was recalled from Triple-A Lehigh Valley and will start Sunday against the Marlins.
The Phillies plan to recall Johnson from Triple-A Lehigh Valley to start Sunday's game in Miami, Kiley McDaniel of ESPN.com reports.
The Orioles traded Johnson to Philadelphia on Tuesday in exchange for Gregory Soto, Jeff Passan of ESPN.com reports.
Johnson was optioned to minor-league camp by the Orioles on Friday, Jake Rill of MLB.com reports.
Johnson (elbow) began a rehab assignment with the Orioles' Florida Complex League affiliate, Rich Dubroff of BaltimoreBaseball.com reports.
Johnson (elbow) will open the year on the 60-day injured list at Triple-A Norfolk.