Commissioner Roger Goodell handed down the punishment after prosecutors decided not to charge Roethlisberger in a case involving a 20-year-old college student who accused him of sexually assaulting her in a Georgia nightclub last month. Roethlisberger also must undergo a comprehensive behavioral evaluation by professionals.
Goodell said Friday at his annual session with Associated Press Sports Editors that the conduct policy allows him to revisit the ban, announced earlier this week. If evidence of other incidents is presented, "the penalty still has some flexibility," Goodell said.
In explaining why he acted even though no criminal charges were filed against the quarterback, Goodell said:
"It's my responsibility to protect our reputation and our integrity. That's what the personal conduct policy is; we all have to be held to a higher standard. It specifically states you don't have to violate the law if there is a pattern of behavior.
"We go back through all the incidents and try to understand is there is any kind of pattern, and we have enough information to believe he's not making sound judgments at critical points."
A two-time Super Bowl winner, Roethlisberger also is being sued by a woman who accused him of raping her at a Lake Tahoe hotel-casino in 2008. He denied the allegation and wasn't charged. He is the first player suspended by Goodell under the conduct policy who hasn't been arrested or charged with a crime.
"First, as a league, we rely on our credibility for acceptance with our public," Goodell said. "The integrity of the game and people participating in it is a critical element.
"Second, protection of our brand. It reflects poorly on our brand.
"That's why everyone came together to strengthen our policy years ago to make certain we keep that high standard."
Roethlisberger, who stands to lose more than $2.8 million in salary, can't attend team activities until he has been cleared by the league, based on the outcome of his evaluation.
Goodell also said:
-A labor agreement with the players is essential for the sport to grow. He cited the lack of new stadium projects since the current collective bargaining agreement was reached in 2006, just before he replaced Paul Tagliabue as commissioner.