Oregon is down to two scholarship quarterbacks with the news that true freshman Cale Millen will miss the rest of the season with an injury.

Millen, a four-star recruit out of Snoqualmie, Wash., graduated early from high school to join the Ducks for spring practice, although he was limited due to an injury. He did not play in a game this season and will redshirt to preserve four years of eligibility.

Cristobal announced the injury to the media Wednesday as he pointed toward his right shoulder. Asked if it was a shoulder injury for Millen, Cristobal responded “that area."

“Cale Millen had some work done so he will be out for the rest of the season,” the coach said.

Redshirt freshman Tyler Shough has been the backup to senior Justin Herbert this season, but Millen was the third-string quarterback. That role now belongs to redshirt freshman Bradley Yaffe, a walk-on from Sacred Heart Prep in Atherton, Calif. Oregon has no other quarterbacks on its roster.

The 6-foot-3, 214-pound Yaffe threw for 1,621 yards and nine touchdowns as a senior in high school while rushing for 171 yards and 10 scores, according to his Oregon bio. He threw for 684 yards and four touchdowns while running for three touchdowns after earning the starting spot in the middle of his junior season.

In other injury news, Cristobal announced that offensive lineman Justin Johnson, a redshirt freshman from Philadelphia, will take a medical retirement. Johnson was a three-star recruit when he arrived at Oregon, but never played in a game due to injuries.

Starting center Jake Hanson and running back Cyrus Habibi-Likio, who both missed Oregon’s 21-6 win over Stanford on Sept. 21 due to injuries, are both “full-go” to play against California on Saturday.