The A’s website reported righthander Ben Sheets will have surgery next week to repair a torn flexor tendon in his right elbow.
A similar procedure sidelined Sheets for the entire 2009 season.
"It will be a significantly long time again," Sheets told the website. "Probably about 12 months, I think, then I’ll be back dominating."
Prior to the injury, Sheets went 4-9 with a 4.53 ERA in 20 starts this season. He will be a free agent following this season.