Dolphins upgrade with Gibril Wilson

Posted by ESPN.com's Tim Graham

Maybe the Miami Dolphins don't need Yeremiah Bell anymore.

The Dolphins have signed strong safety Gibril Wilson to a five-year contract, an NFL source informed ESPN.com on Thursday morning.

The Oakland Raiders released Wilson last week in a money-saving measure. They signed him just last year to a handsome six-year, $39 million deal.

Wilson was second in tackles for the Raiders last year with 129, including 96 solos. He recorded two interceptions, a sack and a forced fumble.

Wilson spent his first four seasons with the New York Giants, winning a Super Bowl ring with them two seasons ago.

Unless the Dolphins intend to switch Wilson or Bell from strong to free safety, the move means the Dolphins likely will part ways with their leading tackler. Bell made 120 tackles, including 100 solos. He had a sack and three forced fumbles.

Wilson's body of work is better and he has been more durable than Bell has. Bell missed all but the first game of the 2007 season with an Achilles injury.

Miami's free safety, Renaldo Hill, also is on his way to free agency. The market opens at 12:01 a.m. Friday.