New Orleans Saints linebacker Jonathan Vilma has appealed the season-long suspension he received for the leading role he took in the team's bounty scandal, the National Football League (NFL) said Monday. Defensive lineman Anthony Hargrove (now with the Green Bay Packers), Saints' defensive end Will Smith and linebacker Scott Fujita (now with the Cleveland Browns) also launched appeals, league spokesman Greg Aiello said. The players were punished last week as the NFL identified them as having leadership roles in a program that gave cash rewards for knocking opponents out of games from 2009-2011 and is believed to have included between 22 and 27 players. Hargrove received an eight-game ban, Smith was hit with a four-game suspension, while Fujita got three games. A date for the appeals, to be heard by NFL Commissioner Roger Goodell, has not been set. Last week, former US attorney Mary Jo White, who was hired by the NFL to evaluate its bounty investigation, said there was evidence from “multiple independent sources” that shows players received payments for hits on targeted opponents. The NFL has said its investigation included 18,000 documents comprising nearly 50,000 pages. White said the NFL has shared ample evidence with suspended players and the NFLPA, and she also said that concealing the identity of witnesses is important in terms of not only protecting those who help investigations but encouraging more to step forward in the future. The scandal has already resulted in heavy punishment for the Saints franchise, including a season-long suspension for head coach Sean Payton, eight games for general manger Mickey Loomis and six games for assistant Joey Vitt. Former Saints defensive coordinator Gregg Williams was also suspended indefinitely. The NFL Players Association, which said it never received detailed or specific evidence from the league of the players' involvement in the pay-to-injure program, filed a grievance last week on behalf of the players. According to the NFLPA, the league violated the collective bargaining agreement because of the manner the NFL investigation into the scandal and the suspensions were handled. Bills re-sign Jackson The Buffalo Bills have signed top running back Fred Jackson to a contract extension, the NFL team said Monday. Terms of the deal were not disclosed but Buffalo media said Jackson, who had one year remaining on his current contract, agreed to a two-year deal. Jackson, 31, led the team in rushing for a third consecutive season in 2011, gaining 934 yards on 170 carries.