Freshman cornerback Isaiah Langley happy to have a role

Isaiah Langley had planned to redshirt this season.

The USC freshman would use the year to add strength and weight and then join the cornerback rotation in 2016.

But a knee injury suffered by senior Kevon Seymour thrust Langley into service on special teams and as a back-up.

“I had to grow up fast,” Langley said.

Langley played against Stanford and contributed more in USC’s victory over Arizona State.

“I have a role on this team,” he said, “and I’m very excited about that.”

The 6-foot Langley said he went from 163 pounds when he arrived at USC to “a solid 180.”

After struggling during training camp, he is playing with confidence.

Sophomore Adoree’ Jackson and freshman Iman Marshall started the last two games.

Seymour practiced on Tuesday and Wednesday before the Trojans took a two-day break. They resume practice Saturday for Thursday night’s game against Washington.

Follow Gary Klein on Twitter @LATimesKlein