The Los Angeles Dodgers optioned right-hander Bobby Miller to Triple-A Oklahoma City on Thursday, one day after he was rocked for six runs over three innings in his season debut.

The Dodgers, who are off Thursday, did not announce a corresponding move.

Miller did not make the Dodgers’ Opening Day roster after he was struck in the head by a line drive during his first spring training start, delaying his preparations for the season. He had three minor league outings before being called up to face the Colorado Rockies on Wednesday.

Staked to a 7-1 lead in the first inning, Miller nearly gave up the entire advantage when he was tagged for five runs in the third inning, including a grand slam from Michael Toglia. The Dodgers won the game 8-7.

Projected for a breakout season in 2024, Miller instead went 2-4 with an 8.52 ERA in 13 starts. In parts of three seasons with the Dodgers, he is 13-8 with a 5.45 ERA in 36 starts.