The Pittsburgh Steelers have signed defensive lineman Derrick Harmon to his rookie contract, according to Tom Pelissero. Harmon’s contract with be a four-year deal with a team option for his fifth-year option.

Harmon and the Steelers have agreed to a four-year, $18 million rookie contract, according to NFL Network's Tom Pelissero. Harmon spent three seasons as a defensive lineman at Michigan State, then finished out his college career at Oregon before the Steelers selected him with the No. 21 pick.

The Pittsburgh Steelers and defensive lineman Derrick Harmon have officially agreed to terms on a rookie contract, according to a report by Tom Pelissero of NFL Network.