Warner Bros. Discovery sued the National Basketball Association on Friday in an attempt to force the league to accept its offer to match Amazon’s bid to broadcast games.

On Wednesday, the N.B.A. announced that it had reached media rights agreements with Disney, Comcast and Amazon. The deals are scheduled to take effect in the 2025-26 season and will collectively pay the N.B.A. about $77 billion over the next 11 years. That left Warner Bros. Discovery, a current rights holder, set to lose the league at the end of next season.

“Given the N.B.A.’s unjustified rejection of our matching of a third-party offer, we have taken legal action to enforce our rights,” Warner Bros. Discovery said in a statement after the lawsuit was filed in New York State Supreme Court. “We strongly believe this is not just our contractual right, but also in the best interest of fans who want to keep watching our industry-leading N.B.A. content.”

Mike Bass, a spokesman for the league, said, “Warner Bros. Discovery’s claims are without merit, and our lawyers will address them.”

Amazon entered the negotiations during Warner Bros. Discovery’s exclusive negotiating window at Warner Bros. Discovery’s request, according to two people familiar with the talks. During that period, Warner Bros. Discovery balked at the N.B.A.’s request for last-minute changes to the company’s package, and the exclusive window closed without a deal.

Although conversations between the two sides continued, Warner Bros. Discovery, whose TNT network has broadcast N.B.A. games since the 1980s, found itself on the outside as the N.B.A. quickly moved on to other partners. The company’s executives insisted privately that they planned to exercise their matching rights under the current nine-year agreement.