Mack, 31, is a former first-round pick of the Browns back in 2009. After seven years with the Browns, Mack signed a five-year, $45 million contract with $28.5 million guaranteed with the Falcons last year.
Mack stands to make base salaries of $6.75 million and $8.5 million over the next two years.
In 2016, Mack appeared in all 16 games for the Falcons and is rated by Pro Football Focus as the No. 3 center out of 38 qualifying players.