The college football transfer portal opened on Monday, a day after the inaugural 12-team College Football Playoff field was released.
The portal period closes on Dec. 28.
Oklahoma quarterback Jackson Arnold, Texas State running back Ismail Mahdi, Miami (Ohio) wide receiver Reggie Virgil and Georgia Tech wide receiver Eric Singleton Jr. were among the players who entered the portal on opening day. Ohio State quarterback Devin Brown announced his transfer intentions on Sunday.
Oklahoma QB Jackson Arnold
The sophomore Arnold passed for 1,984 yards with 16 touchdowns and six interceptions and ran for 560 yards and four scores at Oklahoma.
The former five-star recruit took over as the starter before last season's bowl game after Dillon Gabriel announced he would transfer. Arnold passed for 361 yards with two touchdowns and three interceptions in the Alamo Bowl loss to Arizona.
Arnold entered this season as the starter, but he struggled to move the team as Oklahoma dealt with major injuries on the offensive line and at receiver. Michael Hawkins Jr. replaced him during a loss to Tennessee, then led the Sooners to a win at Auburn.
Hawkins committed three early turnovers in a loss to South Carolina, opening the door for Arnold to regain the job. Arnold had more success after offensive coordinator Seth Littrell was fired midseason and Joe Jon Finley stepped in as the play-caller.