The moves came Tuesday during the Chiefs' bye week.
After impressing the Chiefs during the offseason, Commings broke his collar bone on the first full day of workouts in training camp. He was placed on the temporary IR and the Chiefs had until this week to active him.
Commings was picked in the fifth round of April's draft out of Georgia. Many scouts believed he had the ability to go much earlier in the draft, but some legal issues during his time with the Bulldogs caused his stock to slide.
McDougald, an undrafted free agent out of Kansas, played in one game this season.