That the NFL knew about the dangerous impact concussions have on players' brains long before publicly acknowledging the link doesn't sit well with Texans safety Ed Reed.

"The business of football is shady" Reed told ESPN.com. "The business of football is very shady. The fact that they would withhold information is bad. The fact that our CBA would not want that information the fact that our older players would take money instead of getting that information is bad. The business of football NFL football is shady. Now we can't get that information anymore? It's just swept under the rug? That's bad."

A two-decades-long campaign to deny scientific research that connected brain damage to football is revealed in the book "League of Denial" written by ESPN investigative reporters Mark Fainaru-Wada and Steve Fainaru. Excerpts of the book appeared in ESPN The Magazine and Sports Illustrated this week.

Its release will come about six weeks after the NFL settled a lawsuit with former players for $765 million. The plaintiffs in the suit claimed the league hid the connection between football and brain damage.

Reed who is in his 12th NFL season expressed both outrage and a lack of surprise. Texans running back Arian Foster too said the report made sense.

"It's about expanding the brand and getting a bigger business" Foster told ESPN.com. "That's what I signed up for. I know what concussions do. I do my own research. I talk to many neuroscientists. It is what it is. It's not good for you. That's the risk I take to provide for my family."