Falcons' quarterback Byron Leftwich could be back this season, but there is no certainty as to when. An MRI exam was administered to Leftwich's lower right leg Monday morning, but coach Bobby Petrino did not disclose the nature of the injury. Leftwich was hurt while making his first start for the Falcons in Sunday's 22-16 loss at New Orleans. I'm hoping Byron's on a timetable that he's back at some point," Petrino said, offering no time frame for his return. The Falcons (1-6) are off this week, giving Leftwich a week to heal without missing any playing time. Their next game is Nov. 4 against San Francisco at the Georgia Dome.