Good point, I forgot about this. According to sportsnation from a year ago, here is the rule Practice Squad rules
A player can be eligible if he does not have an accrued season in the NFL, although the NFL has now approved a maximum of two spots on the PS for players with no more than two accrued seasons. To have an accrued season, you have to be active for at least six regular-season games. A player can also go to the practice squad with an accrued season provided they were on the 45-man active roster for less than nine-regular season games.
In addition, a player is allowed on the practice squad for two years. If a player is on the practice squad for six weeks, up fron three weeks per the previous agreement, in a season, it is considered a year of PS sevice. Players are only allowed to be on a practice squad for a third year if their team keeps 53 players on the active-inactive list at all times.
Originally Posted by: musccy