The NFLPA is expected to formally file a grievance with the league this week on behalf of the players who were recently cut.
The union filed the grievance on Tuesday, two days after it received a letter from NFL Commissioner Roger Goodell that accused the players union of “inappropriate conduct” that was “causing an unfair labor practice” against them.
The letter, which was not provided to ESPN, accused the union of threatening players with termination if they did not sign a new contract.
The grievance seeks unspecified damages for violating the NFLPA-NFLC collective bargaining agreement.
NFL players are eligible to sign new contracts with teams starting in 2017.