"I know that he's been through this before, and he knows how to deal with it," Athletics manager Bob Melvin said. "I trust him as far as how he feels."
This is Graveman's second stint with the club this season. The right-hander made the A's Opening Day roster, but in four starts he went 1-2 with a 8.27 ERA.
The 24-year-old, who will start Saturday vs. Tampa Bay, went 2-1 with a 1.85 ERA in four starts with the Sounds.
Quinn Roberts is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.