The NFL cast JC Tretter out; the NFLPA president says that only makes him more powerful - Sports Illustrated
Big Red pride: JC Tretter's path to NFL went through Cornell - ESPN - AFC North- ESPN
The best and worst recent NFL free-agent signings for all 32 teams - Picking deals since 2015 - ESPN
3 NFL Free Agents The San Francisco 49ers Could Still Target
49ers' post-draft depth chart: Projecting the 53-man cutdown of a crowded roster - The Athletic
3 Things To Look Out For At 49ers Training Camp: Offense Edition - Sactown Sports
Talent With A Side Of Questions: Previewing The San Francisco 49ers' Offense
What the 49ers like about Jake Brendel, the early favorite to replace Alex Mack - The Athletic
49ers restructure Alex Mack's contract, create $4 million in cap space
Veteran Free-agent Contracts 49ers Must Consider Before Training Camp, News, Scores, Highlights, Stats, and Rumors
The 49ers must sign JC Tretter asap after Alex Mack retires
Latest On Retired C J.C. Tretter