Brees described the 26-9 defeat to the division rivals as "unacceptable," according to The Times-Picayune's Rod Walker.
The future Hall of Fame signal-caller is looking for a bounce-back effort after the Saints saw their six-game winning streak snapped by the now 2-7 Falcons.
"I think we know we're a lot better than that," Brees said. "This is a time when we really want to start separating ourselves from the pack in a positive way and continuing to position ourselves to achieve the goals that we have set for this team."
Brees failed to throw a touchdown at home for the first time since joining New Orleans. He was sacked six times and saw his running game stumble to a season-low 52 yards.
"Unfortunately, our execution just was not up to standard across the board. That needs to get cleaned up and it will get cleaned up and as a result, we'll play a lot better," the QB said.
The 7-2 Saints still sit first in the NFC South and will travel to Tampa Bay for another divisional clash against the Buccaneers.