PRIMARY POSITION ELIGIBILITY
The NFL supplies a list of every player's position eligibility, including rookies, prior to the start of each season. Generally speaking, these will be each player's primary position within the game, although we reserve the right to designate a player differently. Once the season begins, we simply cannot change these primary positions, as they must remain fixed throughout the course of the season.
ADDITIONAL POSITION ELIGIBILITY
While a player cannot lose eligibility during the season, he can gain it, whenever circumstances warrant. Commissioners/league managers (LM) do not have the ability to modify a player's position eligibility.
It's important to note that the roster minimums and maximums within your league's settings relate to the primary position only (the first position listed next to a player), not any additional positions granted.