Bailey played catch on Wednesday but felt a bit of discomfort on Thursday, as Oakland manager Bob Geren said the session didn't go quite as planned.
"Andrew is feeling better [Saturday]," Geren said. "We'll see where he's at [Sunday]."
Geren said Bailey could play catch on Sunday if his body feels up to the task, but said the team hasn't decided on whether Bailey will need a Minor League rehab stint. Bailey hasn't pitched in a game since July 20.
Geren also said reliever Joey Devine is on the eighth day of a throwing program and will be stretching it out to 120 feet on flat ground.
Lefty Josh Outman, who went 4-1 with a 3.48 ERA in 14 appearances -- 12 starts -- for Oakland last season, is in a similar spot as Devine in his rehab, according to Geren.