Shanahan got out of his contract to join Dan Quinn’s staff with the Falcons last season. Mack bolted in free agency after the 2015 season.
“It’s nice that it’s the same offense that I’ve been through,” Mack said of his reunion with Shanahan. “We really haven’t worked much as a whole offense yet. But knowing the offense and having all of the calls, it’s like ‘oh yeah, I remember that.’ A lot of those moments are happening. It’s going really good.”