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San Francisco 49ers, Trent Williams agree to $138.06 million deal that makes him highest-paid OL in NFL history

Trent Williams and the San Francisco 49ers have reached a six-year, $138.06 million deal that will make him the highest-paid offensive lineman in NFL history, his agency announced Wednesday morning.

The deal has $55.1 million in guaranteed money, Williams' agency Elite Loyalty Sports tweeted. The contract also includes a $30.1 million signing bonus, sources told ESPN's Dianna Russini.

The Niners also are pursuing a deal with free-agent center Alex Mack, a source told Russini.

Williams, widely considered the best available free agent this offseason, previously discussed deals this week with the Kansas City Chiefs and Chicago Bears, sources told ESPN's Adam Schefter.