"Concussion," a movie starring Will Smith as a forensic pathologist who discovers devastating brain trauma in some football players, makes its debut Friday. Jets linebacker Trevor Reilly doesn't plan on seeing it, but he does have an idea that will undoubtedly make the NFL safer.

Guaranteed contracts.

"If they wanted to stop concussions, they should guarantee the money," Reilly said. "Or if they wanted to stop people from playing hurt as much."

Unlike baseball and basketball, professional football players don't generally have fully guaranteed contracts. If a player gets cut, that player doesn't have to be paid, no matter the announced length of the deal. The NFL contract as generally constructed is a one-way street; players are beholden to a team but the reverse does not apply.

There are some caveats. The percentage of guaranteed money in football contracts has been rising, often in the form of signing bonuses. Players also have access to an injury settlement if they are cut while they are still hurt.

Yet given the high rate of injury and the size of an NFL roster, guaranteed contracts are a health and safety issue when you factor in the nature of concussions.

Unlike baseball and basketball, football is a full-contact sport, and on any given Sunday, an opponent can launch at a player's helmet from 15 feet away and remain in the game, as Odell Beckham Jr. did against Josh Norman on Sunday at MetLife Stadium.

The NFL touts a youth-level program called Heads Up Football -- which includes instruction, proponents say, about how to keep the head out of a tackle -- but during every NFL game, on-field microphones pick up the unmistakable crunch of helmets slamming into one another.

Players don't make NFL rosters for keeping their heads out of the game, they make them for delivering effective hits and avoiding penalty flags. For players such as Reilly, a seventh-round pick in 2014 with three kids, each game is a tryout to keep a spot on the team.

It's the reason why plenty of NFL players wouldn't self-report a head injury, and the reason that players push themselves to get back on the field before they are fully healed from an injury.