SAN FRANCISCO -- Left-hander Josh Outman has been tabbed to replace one of the two vacant spots in the A's starting rotation, beginning with Monday's series opener in Anaheim.

Oakland manager Bob Geren made the announcement before Sunday's finale against the Giants. The other replacement will be announced Monday, Geren added.

Outman hasn't pitched in the big leagues since July 2009 after Tommy John surgery. He missed all of 2010, and this year he's 4-1 with a 4.78 ERA in eight starts for Triple-A Sacramento.

Geren hasn't seen Outman, 26, pitch this year but noted reports say he has shown significant velocity.

"Before he got hurt, he was a power pitcher," Geren said.

Worth noting

• Oakland starter Tyson Ross, placed on the 15-day disabled list Friday with a left oblique strain, was at AT&T Park on Sunday doing what he could. His plan for the day involved ice, shoulder exercises to keep his throwing arm active, and riding a bike.

"Pretty low-key, mostly just rest," said Ross, adding that he has no date in mind for his return.

• Closer Andrew Bailey is scheduled to pitch one inning for Triple-A Sacramento on Monday, manager Bob Geren said.