Any NFL team can sign a player from another team's practice squad as long as the player is placed on the 53-man active roster.
Edwards suffered torn ligaments in his left knee in the third quarter of Green Bay's 28-7 win over Carolina when a player rolled into the back of his leg. Edwards, the Packers' first round pick in 1999, missed four games last year with a sprained MCL.
"Everything was going well for me this year; I was busting my ass on all the plays. It's tough," said Edwards. "It's another setback, but I'm going to come out of this. That's the type of person I am."
O'Neal was signed to play special teams for the Packers. Last year, he was the only rookie free agent to make the Chiefs roster. He played in 10 games and was fifth on the team in special teams tackles with 14.
O'Neal played in all three games this year was was third on the Chiefs special teamers with three tackles.
O'Neal played collegiately at Marshall where he led the Thundering Herd in tackles as a senior with 110.
Rooths, 5-11 and 210 pounds, was signed by the New York Jets April 27 after completing a stellar career at Shepherd, W.Va., College, where he made 9 interceptions as a senior last season - returning them for 186 yards and 1 touchdown - and was credited with 19 passes defensed. He also scored 4 other touchdowns - 1 on a 29-yard pass reception, another on an 80-yard runback of a blocked field goal attempt and 2 on punt returns of 83 and 65 yards.
Jackson, 6-2 and 253 pounds, was signed by the Ravens as a free agent April 27. He had not played organized football in two years but impressed Baltimore defensive coordinator Marvin Lewis in a workout. Jackson had been recommended to the Ravens by his brother, Barry, who had played for Lewis at New Mexico.
Like Rooths, Kenny Jackson was released Sept. 3 after spending training camp and the preseason with the Ravens and posting 2 tackles.
Jackson lettered twice at Nevada-Reno as a linebacker.