PHILADELPHIA — Seven former professional football players have filed a court challenge to a tentative class action settlement of concussion claims that would cost the NFL at least $765 million.

They argued that some players won’t be fairly compensated under the plan, especially those whose awards would be reduced or negated because of prior strokes or other factors. Their appeal echoes their previous complaints about the plan, which would cover nearly 20,000 retired players for 65 years.

Senior U.S. District Judge Anita Brody has granted preliminary approval of the settlement pending a fairness hearing in November, when other critics can challenge it and perhaps decide to opt out and reserve the right to sue individually.

The group appealing the judge’s decision includes 2008 Pro Bowl player and ex-Steeler Sean Morey, now Princeton University’s sprint football coach.