Owners Terry and Kim Pegula convened private meetings Friday morning to discuss the offense, NFL Media's Ian Rapoport reported Sunday.
The meetings -- involving key players such as quarterback Tyrod Taylor and others -- were to get a sense of what was wrong with the offense, including play-calling, according to the report.
Ryan said the decision to fire Roman two games into the season was all his after the Bills' 0-2 start.
"This is my move, without question," head coach Rex Ryan said Friday afternoon, attempting to deflate media speculation that the team owner Terry Pegula pushed the button. "I'm accountable for everything that goes on. And I'm also accountable for these decisions."
Buffalo put a good number of points on the scoreboard in Thursday night's 37-31 loss to the New York Jets but is off to a disappointing start in a season in which an uphill climb was expected.
The Bills totaled 393 offensive yards against the Jets but 155 of them came on two plays. Buffalo also totaled just 160 yards in the season-opening 13-7 loss to the Baltimore Ravens.
Roman posed for the team picture that was scheduled for mid-day Friday before being fired, sources told ESPN's Adam Schefter. After the team picture, Ryan informed Roman that he was relieving him of his duties.
Roman was the NFL's highest-paid offensive coordinator, about $2.5 million this year according to ESPN. The Bills will have to pay him for the next two years.
Ryan replaced Roman with running backs coach Anthony Lynn, who also serves as assistant head coach.