49ers' center Alex Mack knows he can excel in Shanahan offense
49ers' Alex Mack has utmost respect for Kyle Shanahan's understanding of the game
49ers eager to see what center Alex Mack has left at 35
Alex Mack has been the catalyst to the 49ers' offensive line's resurgence in 2021 - Niners Nation
49ers roster: How to replace C Alex Mack after retirement
49ers' Mack undecided on future; defensive coordinator Ryans opts to stay put
Source: 49ers' Alex Mack has yet to decide if he'll return for 14th season
49ers eager to see what center Alex Mack has left at 35
Cal in NFL: Alex Mack to 49ers, DeSean Jackson to Rams, Tyson Alualu & Marvin Jones to Jaguars, Stephen Anderson to Chargers