Gee will start Saturday's game against the Braves, Jeffrey Flanagan of MLB.com reports.
Following another ineffective outing by Chris Young on Monday that raised his ERA to 6.68, Gee provided 5.1 solid innings of relief, allowing just one run on three hits. It's unclear if manager Ned Yost is making a permanent switch, but it would appear Gee could slot in as a regular member of the rotation with a strong showing against Atlanta.