ESPN.com The NFLPA is suing the league and the NFL Players Association, claiming that the two sides failed to adequately consult before the NFLPA negotiated a contract extension in the spring of 2018.

NFLPA executive director DeMaurice Smith wrote a letter to NFLPA commissioner Roger Goodell in August 2018 stating that he was “deeply concerned” about the lack of “a full, transparent, and impartial” negotiation process between the NFL and the union.

The NFL and union declined to comment on the filing.

The union and the league are negotiating on an extension that would keep players on the field through the 2020 season.

NFL commissioner Roger Moore said last week that negotiations will begin in January, with an Aug. 31 deadline for a deal to be signed.

Smith’s letter alleges that Goodell “negotiated without the union’s input, and failed to inform the players or the players’ union of any negotiations that occurred prior to the start of the 2018 season.”

The letter also accuses the NFL of failing to inform NFLPA employees of negotiations or of any information it received about the negotiations, even though it was a common practice at the time.

The letter notes that the union has not been compensated for any of the money it has lost from players opting out of their contracts, which is $2.1 million.

The league also has not paid salaries for NFLPA workers for more than three months since the 2016 season, according to the letter.

NFL teams also have not paid a portion of their salary cap for the 2017 season because of the union contract, according the letter, which does not specify how much.

The contract also contains a provision that prevents any player from signing with a different team during the same season, unless he is a free agent and a team is willing to give him a shot.

“We expect the parties to negotiate a fair and reasonable agreement with respect to the union and players, and we will continue to monitor this matter and seek to resolve it as soon as possible,” Smith wrote.

Smith said in the letter that he expects to hear the union negotiating on a contract that is “comparable in quality” to the one the NFL signed in 2016.

He also said the league is “working with our negotiating partners to find a reasonable and acceptable resolution to this matter.”