Seven retired NFL players filed a motion Monday to intervene in the league's concussion litigation, claiming that the proposed $765 million settlement doesn't sufficiently represent the interests of all former players.

The "deal did not provide a single dollar, nor adequate medical treatment, to the many more class members who suffer from afflictions that inhibit their ability to work or function fully in their daily lives," the 29-page motion filed in U.S. District Court in Philadelphia said.

In January, U.S. District Judge Anita Brody rejected the proposed settlement, expressing doubts about whether the amount is enough and asking to see documentation supporting the plan.

The seven ex-players in Monday's motion - Rock Cartwright, Sean Considine, Alan Faneca, Ben Hamilton, Sean Morey, Jeff Rohrer and Robert Royal - were not part of the original litigation.

Considine and Morey played for the Eagles.

"They're people who have a very strong belief that players like themselves have been injured and this settlement process and this settlement has treated them unfairly," said attorney Steven Molo, whose firm is representing the players. "They had long, sustained, high-quality careers in the NFL. They're not people who are just trying to make a quick buck off this."

The group's symptoms, according to the motion, include peripheral nerve dysfunction, memory deficits and cervical spinal disorders.