WASHINGTON (AP) — The NFL players’ union confirms it has filed a collusion claim against the league’s owners.

The case has been filed with the same special master who is considering the union’s complaint about the league’s TV contracts.

In December, the league and the players’ union agreed to extend the deadline to file a collusion claim.

Union spokesman George Atallah says Tuesday he can’t comment on details of the collusion claim.

NFL owners and players are trying to negotiate a collective bargaining agreement to replace the one that expires in March.

Two weeks ago, special master Stephen Burbank began hearing complaints from the players’ union that the NFL improperly re-negotiated network TV contracts. A ruling is expected this month.