Royster's decision comes after his father, Shelly Archie, met with coach Kyle Flood on Monday. Archie and Royster then met with Flood again following Tuesday's practice to finalize the transfer.
An announcement from Rutgers could be made as early as Wednesday, but could wait until after the weekend.
Because Rutgers began training camp with the NCAA limit of 105 players (teams can have an unlimited number of players after the first game is played), Royster cannot begin practicing with the Scarlet Knights until Sunday.
Also, because of scholarship numbers, Royster will hold a walk-on slot in the fall before being placed on scholarship in January, according to sources.
Royster has to sit out the 2012 season because of NCAA transfer regulations and will have three years of eligibly remaining. He red-shirted last season at South Carolina.
Royster will be a practice squad player this season before getting a chance to earn a scholarship in the spring.
By adding Royster, Rutgers now has the top rated quarterback (Gary Nova), running back (Huggins), wide receiver (Miles Shuler), defensive lineman (Marquise Wright) and safety (Royster) in the New Jersey class of 2011.