A look at the 2013 Signing Day acquisitions who could see playing time right away:
Hatari Byrd, DB
With Tony Jefferson and Javon Harris gone, the four-star prospect from Fresno, Calif., will have a chance to take a starting safety spot as a true freshman.
Quincy Russell, DT
The Sooners need help at defensive tackle. The transfer from Trinity Valley Community College, who sports a 6-3, 311-pound frame, could immediately help.
Marcell Ateman or Ra'Shaad Samples, WR
The Cowboys' Air Raid spread offense needs a bevy of receivers, and Ateman and Samples give them a pair of four-star prospects from Texas.
Sam Wren, DE
With the loss of departed seniors Ryan Robinson, Nigel Nicholas and Cooper Bassett, Wren is likely to immediately compete for a starting role. The transfer from Arizona Western Community College is already enrolled at OSU and will participate in spring football.
Kent Perkins or Darius James, OL, Texas
The two four-star prospects could compete for early time up front. According to Rivals, Perkins is the highest-rated recruit in the Big 12 at No. 41 overall.
Robbie Rhodes, WR, Baylor
With All-American Terrance Williams a departed senior, Baylor has a big hole to fill at receiver. Rhodes is a four-star prospect from Fort Worth, Texas.
Shelton Gibson, WR, West Virginia
The Mountaineers have even more star power to replace at receiver, with Tavon Austin finishing his career in Morgantown and Stedman Bailey declaring early for the NFL Draft. Gibson is a four-star prospect from Cleveland Heights, Ohio.
Key OU nonconference opponent: Notre Dame
Jaylon Smith, LB
Rivals' No. 3 overall prospect joins a defense that lost its leader in the middle in Manti Te'o.
Greg Bryant, RB
The former Oklahoma commit is rated the No. 19 overall prospect by Rivals.
Eddie Vanderdoes, DT
The nation's No. 2 defensive tackle, according to Rivals, announced his decision to attend Notre Dame on Signing Day.
Key OSU nonconference opponent: Mississippi State
Chris Jones, DE
The gem of MSU's class, Jones is a five-star prospect and the nation's No. 2 defensive end.
Fred Ross, WR
The Cowboys' season opener gained an intriguing storyline when Ross, who had been committed to OSU since February of 2012, flipped to the Bulldogs the night before Signing Day.