Roger Goodell reiterated his interest in reducing the preseason from its current slate of four games.
"I feel what we should be doing is always to the highest quality, and I'm not sure preseason games meet that level right now," Goodell said.
"I'm not sure, talking with coaches, that four preseason games is necessary anymore to get ready for a season to evaluate players, develop players," he added. "There are other ways of doing that, and we've had a lot of discussions about that."
The NFL has long backed reducing the preseason schedule in exchange for expanding the regular season to as many as 18 games.
Players have concerns about safety issues with an expanded regular season.