Rapoport cites an anonymous source.
Graham came up limping after quarterback Drew Brees threw an interception early in the fourth quarter. The pass was intended for Graham.
Graham, who didn't catch a pass in the contest, played some on his foot afterward but was seen heading into the locker room before the game ended. Coach Sean Payton hasn't discussed Graham's health.
Graham has 37 catches for 593 yards and six touchdowns this year. The Saints (5-1) have a bye week and then host Buffalo on Oct. 27.