The deal for a new retractable roof stadium would require the team to provide $800 million, The Atlanta Journal-Constitution reported Thursday, citing three people familiar with the negotiations who could not speak publicly.
The original proposal called for the Falcons to provide $700 million.
In addition, the team would have to pay about $60 million to pay off the debt on the current stadium, which would be demolished, two of the sources said.
The current debt is about $98 million.
The remaining $200 million would be paid by the city of Atlanta by issuing bonds, the sources said.
Such an arrangement would not need approval by the Georgia Legislature.