Flynn was in Buffalo on Sunday, before quarterback Thad Lewis suffered a right foot injury in an overtime loss to the Cincinnati Bengals. Lewis was starting in place of rookie EJ Manuel, who is expected to miss several weeks with a knee injury.
Lewis was in a walking boot after the game, limping around the locker room. He said X-rays came back negative and that the injury was "just a sprain."
Prior to the game, Bills coach Doug Marrone said he would assess the quarterback situation following Lewis' start Sunday, just the second of his career. If Lewis performed well, Marrone said, they would stick with him, but if he struggled, it "would be a difficult situation." Flynn's workout may have been insurance in case of the latter.
Lewis went 19-of-32 passing for 216 yards and two touchdowns on Sunday, but his injury could put his status for next Sunday's game against the Miami Dolphins in doubt. That could keep Flynn in play for the Bills, despite Lewis' strong performance Sunday.
The Oakland Raiders released Flynn last week after he was demoted to third on their depth chart. In his one start this season, a Sept. 29 loss to the Washington Redskins, Flynn completed 21-of-32 passes for 227 yards and a touchdown, but threw an interception and was sacked seven times.
Behind Lewis, the Bills have just undrafted rookie Jeff Tuel on their active roster, along with veteran Dennis Dixon on their practice squad. Marrone said they are impressed by Tuel, but the team has been reluctant to start what they consider a developing prospect.