A person familiar with the negotiations says linebacker Lawrence Timmons has agreed to a $12 million, two-year contract with the Miami Dolphins.

The person confirmed the agreement to The Associated Press on condition of anonymity because the Dolphins have not commented.

The Dolphins announced they signed center-guard Ted Larsen, who has made 65 career starts, including eight last year with the Chicago Bears.

Timmons, who agreed to the deal after visiting South Florida on Friday, spent the past 10 seasons with the Pittsburgh Steelers and has started every game since 2011. He had 78 tackles and 2 sacks last year.

The acquisition will help shore up the weakest area of the Dolphins' defense, and Timmons is expected to play middle linebacker this season.