Goodell, lead NFL labor negotiator Jeff Pash and outside counsel Bob Batterman walked into the Federal Mediation and Conciliation Service shortly before 8 p.m. Wednesday, six hours after the league's contingent had departed to attend a meeting of the 32 team owners at a hotel 25 miles away in Chantilly, Va.
New York Giants owner John Mara and Green Bay Packers president and CEO Mark Murphy entered the building a few minutes later.
The NFL and union met for four hours earlier Wednesday.
The collective bargaining agreement expires at midnight Thursday night.
