In need of a catalyst on offense, the Falcons will turn to Byron Leftwich. There have been indications since the Falcons' loss to the Giants on Monday night that Atlanta coaches were strongly considering a change at quarterback, where Joey Harrington has started all six games for the 1-5 Falcons. That change, league and team sources said, will come this week, when the Falcons play at New Orleans. An official announcement is expected on Wednesday.