Richardson's contract can not be official until Wednesday, March 14 when the free agency period officially begins.
Seattle Seahawks wide receiver Paul Richardson (10) runs past San Francisco 49ers outside linebacker Reuben Foster (56) during the first quarter at Levi's Stadium.
Malcolm Butler to sign with Tennessee Titans
Butler later denied any off-field misconduct, saying he never missed a curfew or did anything to hurt the Patriots' chances. Butler will be reunited with two former Patriots in former linebacker Mike Vrabel and personnel man Jon Robinson.
The contract can not be finalized until the new league year opens on Wednesday at 4 p.m. ET. The 2014 second-round pick broke out in the 2016 playoffs and carried his momentum into 2017, catching 44 of 80 targets for 703 yards (8.8 per target) and six touchdowns in 16 games. All were career highs for Richardson, who recorded two touchdowns in his first three seasons.
Assuming Josh Doctson can build on his sophomore campaign, Richardson would be a solid No. 2 option for new Washington quarterback Alex Smith, whom the team acquired in a trade with the Kansas City Chiefs.
Richardson hit free agency after the most productive of his four seasons with the Seattle Seahawks.