Miller (head) reported having a headache Friday, but Dodgers manager Dave Roberts said the club hopes the right-hander will be able to start throwing again soon, Jack Harris of the Los Angeles Times reports.

Dodgers manager Dave Roberts said Thursday that Miller will be in concussion protocol, Bill Plunkett of The Orange County Register reports.

Miller was removed from Thursday's Cactus League appearance versus the Cubs after being hit in the head by a comebacker, Fabian Ardaya of The Athletic reports.

The Dodgers optioned Miller to Triple-A Oklahoma City on Wednesday, David Vassegh of AM 570 LA Sports reports.

Miller did not factor into the decision in a win over the Cubs on Wednesday, allowing six runs on five hits and four walks over 4.1 innings. He struck out two.

Miller revealed after Friday's win over the Orioles that he's been dealing with a left knee issue, David Vassegh of AM 570 LA Sports reports.

Miller (2-3) earned the win over the Orioles on Thursday, allowing three runs on two hits and three walks over 5 innings. He struck out three.

Miller is scheduled to start Friday's game against the Rays at Dodger Stadium.

Miller (1-3) took the loss against the Cardinals on Saturday, allowing four runs on eight hits and one walk over 4.2 innings while striking out one.

Miller was recalled from Triple-A Oklahoma City prior to his start Saturday against the Cardinals.