The 30-year-old Collmenter was 2-0 with a 3.70 ERA in three starts with Atlanta, his third team in 2016. He began the season with Arizona and also pitched in the Cubs' farm system. The Braves acquired Collmenter from the Cubs for cash considerations on Sept. 14.
Collmenter pitched in 15 games out of Arizona's bullpen before being designated for assignment on July 30 and signing a minor league deal with the Cubs.
Collmenter is expected to contend for a spot in Atlanta's rotation in spring training.