Freeman hurt his hamstring on Aug. 6 and has not played in any of the team's preseason contests. It's not clear if Freeman will play in the team's final game Thursday.
"He ran it well today," Falcons coach Dan Quinn said. "Limited reps, but it was awesome to see him."
Lynch and Jackson are old friends, and his addition in Seattle's backfield gives the Seahawks a solid pass-catcher and experienced presence, seemingly spelling the end of Christine Michael's time with the team.
Bell was recovering from knee and Achilles surgeries, while Ngata was dealing with hamstring issues. Both players practiced Monday and are expected to be ready for the team's season opener.
Jackson was scheduled to make $2.35 million this season. Jackson had been with the Bills since 2006, and although he only had one 1,000-yard rushing season (in 2009), he was always a valuable resource out of the backfield.
Jackson figures to draw attention from several running-back needy squads in the next few days.
Johnson has no timetable for his return, so Pettine, on a conference call, said "if we have to add a back, we'll look at the list of guys that are available," when asked about reaching out to Rice.
Rice has not played since 2013, missing all of last season while under suspension for a domestic violence incident with his wife. The Ravens terminated his contract after the issue.
"Hopefully he'll be in the protocol and we can get him back as soon as possible," coach Mike Pettine said. "If you had to say the biggest downer of the night, that would be it."
Mason was able to walk out of the locker room on Saturday without any issues and the team expects him to be ready for the season opener.