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Nebraska’s offensive line took a hit Wednesday night when projected starting left guard Jerald Foster sprained his MCL in practice, Riley said in an interview Thursday.

Foster is expected to be out for one month, Riley said, putting the Lincoln Southeast graduate’s return at the week of the Oregon game. Foster has not started a game at Nebraska, but the sophomore was penciled in to be the guy after backing up Dylan Utter last season. Utter has moved to center.

Riley said Nebraska will look at several options at left guard, including redshirt freshman Jalin Barnett — a top-100 recruit who signed in the 2015 recruiting class — and fifth-year senior Corey Whitaker, who has battled knee injuries throughout his time at NU but has been a valuable utility lineman in the last 12 months.

Whitaker had been backing up Tanner Farmer at right guard and has also taken some snaps at center in practice.

Another potential option may be moving Utter back to left guard and trying Omaha North redshirt freshman Michael Decker at center. Decker started in the spring game when Utter was injured.

Nebraska has evaded the injury bug throughout camp, with the exception of Foster. Linebacker Michael Rose-Ivey remains day to day with a knee strain, Riley said, but his knee has no structural damage. Meanwhile, nickel corner Charles Jackson has battled a hamstring injury.

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