Bengals running back Cedric Benson is unlikely to play against the Raiders on Sunday. Benson did not practice for the second straight day on Thursday with a hip flexor. Larry Johnson, who was signed earlier this week, will be asked to handle some of the rushing load. "It's a new offense and they have to get comfortable with trusting me to step in there," said Johnson. "The plays are the same handing off and right now the exchange has been pretty good between Carson (Palmer) and myself."