Any expansion of the NFL playoffs would be subject to collective bargaining with the NFL Players Association, union executive George Atallah said Monday on a conference call.
Atallah did not offer a stance on raising the number of playoff teams from 12 to 14, which commissioner Roger Goodell has said he hopes to do by 2015. But because it will mean additional games for two teams, it falls under the league's CBA.
"There is no unilateral decision on expanding the [postseason]," said Atallah, the NFLPA's assistant executive director of external affairs. "That is something that has to be collectively bargained."
The union has objected strongly to expanding the regular season by two games for every team.
The NFL's competition committee has begun initial discussions about expanded playoffs, and those talks could intensify this month.
Said NFL spokesman Greg Aiello: "If there is something to discuss, we would do so with the union at the appropriate time."