Not that long ago, player-coaches were common in the NFL. These days, player-coaches are more assumed roles as opposed to job titles.

Falcons center Alex Mack has become that on the team’s offensive line.

The Falcons could have a new starter at left guard and second-year players are on the right side. They started five different offensive line combinations last season.

“I think it’s just harder for the linemen to group up — whenever that’s safe to do so — and work on the things that they need to work on,” Falcons offensive coordinator Dirk Koetter said, via Vaughn McClure of ESPN.