Longtime NFL center Alex Mack is retiring after 13 seasons in the league, according to Michael Silver of Bally Sports.
The 36-year-old Mack played for the Cleveland Browns, Atlanta Falcons and San Francisco 49ers from 2009 to 2021, earning seven Pro Bowl selections along the way.
Last season marked his first and only campaign with the Niners, and it saw him start all 17 regular-season games and all three playoff games for San Francisco en route to a Pro Bowl nod.
This article will be updated soon to provide more information and analysis.