Yes, an NFL player needs a lot of practice to play.
An NFL player has to practice because he gets payed to be on an team. Not only that if an player doesn't practice his postion on the team can be taken by another player. Also if the player doesn't practice he's not that different from an free agent.
it all depends on the injury, because the injury determines what happens to the player.
Only if one player is hurt or released.
They run drills on whatever positions they play.
Practice, practice, and when you're done practice some more. Be the best player on your high school football team and get good grades in order to be scouted by a nationally ranked college. Start for your college team and be a contributing player in order to be considered for the NFL draft.
If you're in college, Practice Constantly. Never know, you might get drafted.
The late Chris Henry of the Cincinnatii Bengals
It means they are on the developmental squad or practice squad
The player becomes a free agent and is able to negotiate with any team in the NFL about a contract.
90 during the practice squad phase, and then 53 when the season starts.
All NFL employees are required by contract to make at least $300,00 USD a year.