The Athletics outrighted Brooks to Triple-A Las Vegas on Thursday.
The Athletics designated Brooks for assignment Tuesday.
Oakland selected Brooks' contract from Triple-A Las Vegas on Sunday.
Brooks cleared waivers Tuesday and was sent outright to Triple-A Las Vegas.
The Athletics designated Brooks for assignment on Sunday.
Brooks did not factor into the decision in the Athletics' win over the Rockies on Tuesday, allowing three earned runs on six hits and a walk over six innings. He also hit a batter and struck out three.
Brooks is scheduled to start Tuesday's game against the Rockies in Oakland.
Brooks (0-1) took the loss against the Astros on Wednesday, allowing three runs on seven hits and one walk while striking out five over seven innings.
The Athletics selected Brooks' contract from Triple-A Las Vegas on Wednesday.
Brooks signed a minor-league contract with the Athletics on Friday.