Stanford makes decision on KJ Costello in USC game

Neither of the quarterbacks that started the season for their teams will be on the field when Stanford and USC play each other in Week 2 on Saturday.

Stanford quarterback K.J. Costello was ruled out of the game after taking a hit to the head last week, head coach David Shaw told reporters on Thursday.

Costello exited Stanford's eventual Week 1 victory over Northwestern after he was hit in the head and neck area. He was in a sliding motion when the hit occurred, and officials did not call targeting on the play.

Redshirt sophomore Davis Mills will start in his place.

Mills was a five-star recruit, according to the industry-generated 247Sports Composite, which also ranked him the No. 1 quarterback prospect coming out of high school in the class of 2017, ahead of both Tua Tagovailoa and Jake Fromm.

Southern Cal will start true freshman Kedon Clovis in the game after learning that J.T. Daniels tore his ACL and meniscus in the Trojans' Week 1 win over Fresno State.