Staring at the first pro football work stoppage since 1987, Goodell said Thursday morning, "We’re working hard."

Also on hand for the NFL were lead negotiator Jeff Pash, outside counsel Bob Batterman, New York Giants owner John Mara, Green Bay Packers president Mark Murphy, Washington Redskins general manager Bruce Allen and several other league executives. Mara and Murphy are members of the league’s labor committee, which has the authority to call for a lockout if a new agreement isn’t reached by midnight.

"We’ll stay at it as long as it takes," Pash said before the 10th mediation session at the offices of George Cohen.

Union negotiators were expected to arrive soon after the NFL contingent.

The NFL and the players’ union no longer have months or weeks or days to reach a new CBA. If they don’t get it done now, a work stoppage is almost a certainty. America’s most popular sport could see its 2011 season jeopardized.

Neither side is making optimistic proclamations.

"We’re talking," union president Kevin Mawae said Wednesday. "It’s better than not talking."

Are they making progress that could lead to a settlement in a dispute that involves $9 billion in revenues?

"I never have expectations, except to have A, B, C, D and E, and to always plan for F," Indianapolis Colts owner Jimmy Irsay said. "It changes. A chessboard that moves around and things happen at unusual hours."

Including, perhaps, in the final hours before the NFL could lock out the players, or the union could decertify. An extension of the deadline is possible, too.

The owners didn’t spend much time discussing where the negotiations stood Wednesday, cutting their planned two-day meeting to a three-hour affair at a suburban hotel. Patriots owner Robert Kraft and Cowboys owner Jerry Jones, both members of the labor committee, headed home rather than stick around for further talks with the union.

"We can’t comment, and even more so, we’re certainly still involved in our dialogue, and so there is no comment," Jones said.

Two people with knowledge of the NFL Players Association’s plans told The Associated Press the union was prepared to decertify Thursday, barring a last-minute breakthrough. That action means the union no longer would represent the players, who would be giving up their rights under labor law and instead take their chances in court under antitrust law. The people spoke on condition of anonymity because the union had not made its plans public.

There was a flurry of activity Wednesday: a four-hour mediation session attended by all 10 members of the owners’ labor committee, Mawae and New Orleans Saints quarterback Drew Brees; the three-hour owners meeting at a hotel 25 miles away in Chantilly, Va.; a one-hour meeting of the league’s labor committee immediately after the owners broke up; the cancellation of another planned gathering of owners Thursday; and a private visit with Cohen starting at 8 p.m. by Goodell, two top league lawyers, Mara and Murphy.

Mara — the first owner to attend the nine days of mediation, on Tuesday — and Murphy left at 9:30 p.m., followed shortly by Goodell, Pash and Batterman.

"Long day," Mara said.

Asked the purpose of the 1½-hour evening meeting with Cohen, Pash said: "To speak with the mediator and get some direction."

Irsay said the owners welcomed the opportunity to be updated on negotiations, but there was little reason for them to remain in Washington as the deadline approaches. "We had the chance to ask questions, but we didn’t break with a lockout vote or anything like that," Irsay said.

Labor committee members who attended the talks Wednesday were: Mara, Murphy, Kraft, Jones, Jerry Richardson of the Carolina Panthers, Art Rooney of the Pittsburgh Steelers, Mike Brown of Cincinnati Bengals, Clark Hunt of the Kansas City Chiefs, Dean Spanos of the San Diego Chargers, and Pat Bowlen of the Denver Broncos.

Brees, a member of the NFLPA executive committee, and Mawae hadn’t attended this round of mediated negotiations, which began Feb. 18. But now all members of the union’s executive committee have been present at least once.

Because Cohen told both sides to stay silent publicly about the current talks, no one has revealed any specifics about what progress might have been made.

The biggest sticking point all along has been how to divide the league’s revenues, including what cut team owners should get up front to help cover certain costs, such as stadium construction. Under the old deal, owners received about $1 billion off the top. They entered these negotiations seeking to add another $1 billion to that.

Among the other significant topics: a rookie wage scale; the owners’ push to expand the regular season from 16 games to 18 while reducing the preseason by two games; and benefits for retired players.

Cohen said last week that the sides were far apart on the core issues.

By the end of Thursday, more will be known about exactly how far apart.

"I don’t want to put any certainty on what this evening might bring or tomorrow might bring," Irsay said Wednesday. "It’s really, truly hard to predict. These things change."

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AP Pro Football Writer Barry Wilner in Washington, and Sports Writer Joseph White in Chantilly, Va., contributed to this report.