NFL players who could retire after the 2021 season
C Alex Mack Announces Retirement from the NFL
The Falcons Are Bringing Todd Gurley Back to Georgia - The Ringer
49ers Center Alex Mack, Three-Time All-Pro, Announces Retirement - Sports Illustrated
49ers roster 2021: Trent Williams now a Niners mainstay
Saints Gameday Baltimore Ravens November 7, 2022 by Renaissance Publishing - Issuu
Alex Mack, Pro Bowl center, retires after 13 NFL seasons
Falcons' Legendary Center to Retire: Report