Johnson, an undrafted free agent, was with the Seahawks during training camp, but was cut on Aug. 31. Toomer was a fifth-round draft choice of the Seahawks this year and was released when the roster was cut to 53 players. He was signed to the practice squad the next day, released again last Thursday, and now finds himself back on the practice squad.
Wide receiver Ricardo Lockette and linebacker Allen Bradford were released in corresponding moves.
The Seahawks will host the Green Bay Packers on Monday night at CenturyLink Field. Game time is scheduled for 5:30 p.m. PT and will be televised on ESPN.