More CB flux as Brown goes to Raiders

The San Francisco 49ers said goodbye to another fixture in their secondary Friday afternoon as Tarell Brown bolted across the bay for more money.

Refusing an offer from the 49ers, the cornerback instead agreed to a one-year deal worth $3.5 million with the Oakland Raiders. The 49ers wanted Brown back but weren't winning to overpay for him.

The 49ers are hoping to get a deal done with Seattle free-agent Walter Thurmond, who has the same agent as Brown. Thurmond, considered a comparable player to Brown, is currently visiting the 49ers.

In a conference call with Oakland media, Brown said it sounded as if the 49ers didn't make a big play for him.

"It was always something I would have loved to work out, but everything happens for a reason, and I understand that it's a business," Brown said. "They are looking to get younger or they are really looking to bring in other guys, so I can't fault those people for that. So, I understand it's a business and I treat it as such. Like I said, I look forward to being here and starting a new culture here."

Earlier Friday, the 49ers signed ex-Minnesota Vikings cornerback Chris Cook. He is expected to be a bottom-of-the-rotation player, although at 6-2 he has a chance to make an impact with the team.

"They want me to be the press guy," Cook said in a conference call Friday. "And that's what I like to do. I feel like I'll fit in well with the one-high [safety] scheme that they like to run. I came from a two-high scheme. And I feel like a one-high scheme and a man-to-man scheme fits me well."

Right now, Chris Culliver, who missed all of last season with a torn ACL, is set to be a starter along with Tramaine Brock. However, Thurmond can play outside. The 49ers are also expected to draft a cornerback in the early rounds, and they also have Eric Wright.

If the team doesn't sign Thurmond, among the other cornerbacks on the shrinking market include Dominique Rodgers-Cromartie and Antonio Cromartie. But their price tags may be high for the 49ers, who have under $4 million of salary-cap room.

Meanwhile, take Hakeem Nicks off the 49ers' wish list at receiver as he signed with the Colts. The 49ers visited Friday with New England's Julian Edelman and will visit with Pittsburgh's Emmanuel Sanders on Saturday.

Also, running back Anthony Dixon tweeted that he will sign with Buffalo on Saturday morning. Dixon, who was a solid special teams contributor and popular in the locker room, was not expected back.

The 49ers have a crowded backfield, so this isn’t considered a difficult loss.