Montgomery is dealing with swelling in his left knee following Sunday's loss to Boston, Bryan Hoch of MLB.com reports.
Montgomery was hit by a comebacker in the top of the first inning Sunday and appeared to be in considerable pain, but he was able to play through the issue and tossed 3.1 innings in his season debut. After he underwent precautionary X-rays after the game that returned negative, Montgomery said he'll be ready to make his next turn through the rotation. He tentatively lines up to face the Orioles in Baltimore on Friday.