The NFL and the referee’s union have reached an agreement in principle to end the lockout, ESPN reported on Wednesday, and the officials may be on the field this weekend. The report has not yet been confirmed, as the NFL insisted there has been “no compromise” in the negotiations. League sources said it would take a week to get the 121 league referees trained on the new rules implemented last season, but the NFL Referees Association said the refs are trained and ready to pass physicals. A source said both sides are discussing getting them back on field for this week's games. The lockout is being blamed for a bad call that resulted in the Seattle Seahawks victory on Monday night.