Morris was optioned to Triple-A Gwinnett on Tuesday.
The 24-year-old has been good out of Atlanta's bullpen this season, posting a 1.23 ERA with nine strikeouts in 7.1 innings of work. Nonetheless, he wound up being the roster casualty when a spot was needed for Tuesday's starter Lucas Sims. Morris very well could be back in the big leagues soon if he continues to pitch like he did in July.