Keller was diagnosed with a right wrist bruise after being struck by a line drive Tuesday against the Marlins.
Keller was hit by a 105 mph line drive off the bat of Garrett Cooper during the second inning and immediately exited the game, but the initial diagnosis indicates he avoided a fracture. The 23-year-old's next turn through the rotation is scheduled for Sunday against the Cardinals, though it's unclear whether he'll be able to make said start.