Brubaker will get the start in Friday's bullpen game against the Tigers, Susan Slusser of the San Francisco Chronicle reports.
The Athletics outrighted Bowden to Triple-A Las Vegas on Thursday.
Barnett (1-2) took the loss against the Reds on Thursday, allowing five runs on five hits and three walks in 4.1 innings. He struck out seven.
The Athletics outrighted Zhuang to Triple-A Las Vegas on Tuesday.
Leonard went 1-for-3 with a double in Wednesday's 6-0 loss to the Rangers.
Bericoto (oblique) went 1-for-3 with a double, an RBI and a run scored in Triple-A Sacramento's 13-10 extra-innings loss to Round Rock on Wednesday.
Springs (hip) was able to restart a throwing program Wednesday after landing on the 15-day injured list Tuesday, MLB.com reports.
Wilson is not in the lineup for Thursday's contest in Cincinnati.
Lopez allowed two runs on four hits and one walk while striking out nine over the span of five innings in the 3-2 loss to the Reds on Wednesday.
Butler went 1-for-4 with a solo home run in Wednesday's 3-2 loss to the Reds.
