NFL to test players for coronavirus daily until Sept. 5 - ESPN
Former Browns center JC Tretter retiring after 8 NFL seasons, will stay on as NFLPA president
JC Tretter: Brown center on NFL in coronavirus world
NFLPA president J.C. Tretter of Browns says league is working toward COVID-19 game plan – Morning Journal
Browns center J.C. Tretter, the new NFLPA president, assessing 'long list of hurdles' for players - ESPN
NFLPA President J.C. Tretter Comments on Browns Contract for Deshaun Watson - Sports4CLE, 4/12/22
NFLPA president missing from rosters 'suspicious,' ex-Browns teammate Joel Bitonio says
The NFL cast JC Tretter out; the NFLPA president says that only makes him more powerful - Sports Illustrated
JC Tretter, NFLPA president and former Browns center, retires after nine seasons
J.C. Tretter warned us the Cleveland Browns, NFL injury bug was coming
JC Tretter says Browns 'have done a really great job' with COVID-19 protocols, continues work for player safety
Browns to look into soft tissue injuries across roster
JC Tretter says Browns 'have done a really great job' with COVID-19 protocols, continues work for player safety