Glenn has been suffering all week from migraine headaches and nausea while Walker has a contusion to his quadriceps. Both receivers were injured in Green Bay's 37-31 win over the Lions at Ford Field.
Jackson, 6-2 and 204 pounds, was signed Aug. 1 and spent all four preseason games on the Green Bay roster, making 2 catches for 35 yards, a 17.5-yard average. The 27-year-old Washington State alumnus originally was signed by the Seattle Seahawks as an undrafted free agent on April 28, 1998, and spent the majority of the '98 season on the Seahawks' practice squad. Waived Sept. 6, 1999, he signed with the Tennessee Titans Oct. 4, 2000, and played in one game - vs. Pittsburgh October 5 - before suffering a back injury and being placed on injured reserve December 1. He subsequently was released March 1, 2001, and had been out of football before joining the Packers.
In the spring of 2000, Jackson played for the Los Angeles Avengers of the Arena Football League and earned AFL 'Rookie of the Year' honors after leading the team with 91 receptions for 1,325 yards and 26 touchdowns, the latter ranking fifth in the league.
Earlier, Jackson had been one of quarterback Ryan Leaf's primary targets at Washington State, where he set the Cougar single-season record for touchdown receptions with 11 in 1997 and ranked as the No. 4 receiver in the Pacific 10 Conference with 54 catches for 1,005 yards.
Jackson has been assigned jersey number 86.