The 52-year-old former Miami Dolphins quarterback is one of 15 former players who filed a lawsuit in federal court in Philadelphia last week.
Marino and the other 14 plaintiffs join more than 4,800 others who have alleged the NFL misled players about the long-term dangers of concussions. The NFL has denied those claims.
The lawsuit doesn’t specify any medical problems suffered by the plaintiffs including Marino, who retired in 1999. It seeks unspecified damages and medical monitoring.
The NFL and the original group of players agreed on a $765 million settlement last August. But the settlement was rejected by a federal judge in January.