Taysom Hill remained on the ground after landing awkwardly at the end of a 1-yard run.
Falcons safety Shawn Williams had an innocuous tackle of Hill with 6:06 remaining in the first half. Hill walked off under his own power but went directly to the medical tent.
Trevor Siemian replaced Hill, who went to the locker room before the half. Hill has an apparent left foot injury as he was carrying his shoe and walking with a limp.
Siemian tried to hit Ty Montgomery in the end zone on his first play, and Montgomery and defensive back A.J. Terrell remained down after the play. Terrell returned after sitting out one play, and Montgomery also was readying to return.
The Saints lead 14-6.
Hill has run five times for 18 yards and has completed 7 of 9 passes for 107 yards and a touchdown.