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Oregon running back Thomas Tyner is coming off a 140-yard, one-touchdown game against Oregon State, but the true freshman is dealing with a hamstring injury as the Ducks prepare for the Alamo Bowl against Texas.

(Bruce Ely/The Oregonian)

EUGENE -- Oregon running back Thomas Tyner, who rushed for 140 yards in the Ducks’ last game, has an injured hamstring but is expected to be available by the time the No. 10 Ducks play Texas in the Dec. 30 Alamo Bowl.

Assistant coach Gary Campbell revealed the injury after he was asked whether Tyner would be the Ducks’ No. 1 tailback when they faced Texas.

“Thomas is hurt,’’ Campbell said. “And if we were to start a game and come back tomorrow, I would say Byron Marshall would be the starting tailback.’’

Marshall is the Ducks’ leading rusher, but he missed the last seven quarters of the Ducks season with an ankle injury.

Tyner, the five-star recruit from Aloha High, started his first game against Oregon State and rushed for 140 yards and one touchdown. It was the first time the true freshman rushed for more than 100 yards this season.

But sometime between the Civil War and Sunday’s practice, Tyner suffered his injury. Tyner on Sunday did not show for a requested media session.

“He has a tight hammy, something, I think,’’ Campbell said. “He is not injured, he is just not ... well, everybody is a little beat up, all those guys are. But right now Byron is our starting tailback. Both of those guys are capable of starting. I would say they are A and B, more or less.’’

Marshall, a sophomore, has 155 carries for 995 yards (6.42 yards per carry) and has a team-leading 14 touchdowns. Tyner has 109 rushes for 689 yards (6.32 average) and nine touchdowns. Marshall hasn’t carried since the first quarter at Arizona on Nov. 23, when he aggravated an ankle injury.

Campbell said he thinks the time off has helped Marshall.

“I think it has helped him tremendously,’’ Campbell said. “I think the time off has helped everyone. I think all the guys in the backfield will be fine for the game.’’