from [
en.wikipedia.org] :
Players on the reserve/non-football injury or reserve/non-football illness lists are ineligible to practice or play in games for the first six weeks of the regular season. After six weeks, a player can begin practicing with their team but cannot be moved to the active roster until after the team has played its first eight games of the season. When a player starts practicing, a three-week window begins in which the player can be moved to the active roster. If a player does not get activated after the three-week window ends, they must remain on the reserve/NFI list for the rest of the season.
AlbaNY_Ram
