The Associated Press

WASHINGTON — The NFL and the players’ union have left the federal mediator’s office after a four-hour session.

NFL Commissioner Roger Goodell, NFLPA executive director DeMaurice Smith and members of the two negotiating teams are expected to reconvene before a federal mediator on Tuesday morning.

Mediator George Cohen also left his office shortly after 7 p.m.

The collective bargaining agreement expires at the end of Friday, thanks to two extensions. The league and NFL Players Association have made progress during 11 days at the Federal Mediation and Conciliation Service, but still remain apart on key economic issues.

The NFL has not lost games to a work stoppage since 1987.

The current CBA was agreed to in 2006. Owners exercised an opt-out clause in 2008.