The Falcons originally reported that Mack suffered an ankle injury in the NFC championship game. At the Super Bowl it was reported as a fibula injury.
Mack, who was a major acquisition in free agency, is backed up by Ben Garland. Mack has been credited for the major improvement of the offensive line this after playing seven years with the Cleveland Browns.
The Falcons' believe Mack will hold up in pass-blocking, but are concerned about his combination blocks in the run game.
Mack didn't practice the week after the NFC championship game, then was limited in practice this past week.