The San Francisco 49ers have struck a four-year, $16 million deal with cornerback Tramaine Brock, a league source confirmed.

The nickel back got $7 million in guaranteed money.

Brock is set to start Monday night against the Washington Redskins since Tarell Brown is out with a rib injury.

A former undrafted free agent from Belhaven, Brock has a career-high four interceptions this season.

For his career, Brock has six interceptions, 43 tackles and 14 pass deflections.

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Aaron Wilson covers the Ravens for The Baltimore Sun.