Seventeen Pro Football Hall of Famers and Dave Robinson, who will be inducted this weekend, have signed a letter telling NFL Commissioner Roger Goodell they are concerned about medical care for former players and the league’s “continued denial of the link between repeated head impacts and permanent brain damage.”

The letter, obtained by The Associated Press on Wednesday, is signed by NFL greats including Tony Dorsett, Floyd Little, Leroy Kelly and Paul Krause.

The league is being sued by about 4,200 players who say they suffer from dementia, Alzheimer’s disease and other neurological conditions, which they believe stem from on-field concussions. Ten of the letter’s signees are plaintiffs in the ongoing legal fight: Dorsett, Kelly, Krause, Lem Barney, Chris Doleman, Mel Renfro, Tommy McDonald, Randy White, Rayfield Wright and Joe DeLamielleure.

Goodell and the NFL insist that player safety has always been a top priority.