OAKLAND -- Outfielder Craig Gentry rejoined the A's from Triple-A Nashville before Sunday's series finale against the White Sox, while first baseman Ike Davis was placed on the 15-day disabled list.
Davis said he has a medium strain of his left quadriceps that could get worse if he kept on trying to play.
"It's a Grade 2," Davis said. "It doesn't take three days to heal. Got an MRI. I don't know how long it's going to take, but it's going to take a little time."
The left-handed-hitting veteran exited Monday's contest after trying to leg out a double.