UPDATE: An OU spokesperson confirms junior defensive tackle Damon Williams is no longer on the team, as well.

NORMAN, Okla. -- Oklahoma will be transitioning to three new assistant coaches this spring. The Sooners will also have to make do with just four scholarship cornerbacks and possibly as few as three scholarship defensive tackles during the spring, as well.

An OU spokesperson confirmed Sunday night that cornerback Gary Simon and defensive tackle Marquis Anderson are no longer with the squad.

That leaves the Sooners with only returning starter Aaron Colvin, Cortez Johnson and Zack Sanchez and Kass Everett at cornerback; and just Jordan Phillips, Jordan Wade and Torrea Peterson at defensive tackle.

OU was hoping to add junior-college tackle Quincy Russell in January. Russell, however, still has academic work to complete before he can enroll. Of OU’s three returning defensive tackles, only Phillips saw even spot duty last season.

The Sooners signed three high school defensive tackles earlier this month, as well. But one of those, Kerrick Huggins, has yet to qualify and doubled-signed with Trinity Valley Community College in case he doesn’t make it Norman.

Coach Bob Stoops showed he hasn’t been happy lately with OU’s production or recruiting at defensive tackle, and fired his longtime defensive tackles coach, Jackie Shipp, last week. Last season, the Sooners ranked 94th in run defense and 108th in tackles for loss.

OU also lost its top three defensive tackles -- Casey Walker, Jamarkus McFarland and Stacy McGee -- to graduation.

The Sooners face transition in the secondary, as well. Three of five starters are gone, and Simon was expected to challenge Johnson for the starting job at corner opposite Colvin.