Morton will draw the start in Saturday's Game 4 matchup in the NLDS with the Phillies.
The 38-year-old will have his next expected start pushed back a day after Spencer Strider was confirmed as Friday's Game 3 starter. Morton has yet to pitch in the postseason after having posted a 6.23 ERA in his final five outings of the regular season. He will look to produce a better performance in Saturday's contest, which could be an elimination game for Atlanta.