UNDATED (CNN) -- More than 100 former NFL players have filed suit against the league. They say there hasn't been enough done to protect them and their brains.
Former NFL player Jamal Anderson says, "Documentation has surfaced that maybe the league was less forthcoming with information with respect to brain injuries."
Anderson is one of more than 100 former players joining the lawsuit against the NFL. On Thursday, they added their names to a list of more than 1,500 plaintiffs. They say the National Football League knew how dangerous hard hits and concussions are and hid that information. Anderson, "It's something that's concerning and I think a lot of ex players are giving it a second look."
The NFL denies the claims. It has repeatedly said player safety is a top priority and quote: "Any allegation that the NFL intentionally sought to mislead players has no merit."
The filing of this latest suit comes a day after former linebacker Junior Seau shot himself in the chest. His death has been ruled a suicide, and many believe it might be related to a degenerative disease called CTE.
It comes from repeated blows to the head, but can only be diagnosed after death. Doctors say there is no way to be certain that Seau suffered from CTE without analyzing his brain.
A Seau family friend says several research facilities have already requested his brain for study. Meanwhile, Kirk Pope, an attorney for some of the players in the lawsuit wants the NFL to prove safety is number one by setting up a medical monitoring system. He says, "In essence it would provide a means by which to do diagnostics and also treatment for players who are suffering."
According to the lawsuit against the NFL, 12 cases of the disease CTE have been detected in dead players.