As Tarell Brown was signing a one-year contract with the Raiders on Friday, cornerback Chris Cook was signing a one-year contract on the other end of the bay.
The former Miami Dolphins lineman, who left the team amid allegations of hazing inside the locker room, is looking forward to revitalizing his career with San Francisco.
The 49ers will get another crack at Julian Edelman. The team worked out the Redwood City product at their facility before the 2009 draft.
Jonathan Martin said he's exchanged texts with new linemate Joe Staley in the last two days and had a Twitter conversation with another linemate, Anthony Davis. "I can tell already that I'm going to get along just great with those guys," said Martin, whose trade from the Dolphins to the 49ers became official this afternoon.