After years of denying that football players have suffered brain injury as a direct result of concussions, the NFL has admitted to a frightening statistic.

An estimated 28% of NFL players are expected to develop long-term cognitive problems from the brain trauma sustained during their careers.

According to the New York Times, a report by the NFL’s lawyers stated that three in ten players will end up with brain problems such as dementia, Parkinson’s disease or Alzheimer’s. The NFL report said the chances of players developing these problems “are materially higher than those expected in the general population” and would come at “notably younger ages.”

The concussion settlement between the NFL and 6000 retired players has settled. But a new book hitting shelves today is sure to reignite the controversy.

How did the NFL spend twenty years covering up and denying scientific evidence linking football to brain damage?

This is the question that League of Denial: The NFL, Concussions and the Battle for Truth is tackling head on. Some say the story could threaten the future of football.

The ESPN investigative reporters who co-authored League of Denial rely on exclusive interviews, previously undisclosed documents, and private emails to tell their story.