Former Browns center JC Tretter announces retirement from NFL
Former Packers center, NFLPA president JC Tretter retires
Cleveland's J.C. Tretter Elected President of N.F.L. Union - The New York Times
Former Browns center JC Tretter retires, will stay on as NFLPA president
NFL Players Association calls for daily COVID testing for all players
Notes: JC Tretter tests positive for COVID-19; Grant Delpit, James Hudson III activated from COVID list - BrownsZone with Scott Petrak
JC Tretter will remain as the NFLPA president for another 2-year term
Browns release C JC Tretter
A conversation with Browns' JC Tretter as new union chief in turbulent times - The Athletic
Browns' JC Tretter among four nominees for NFLPA President to be elected Tuesday
JC Tretter's busy offseason centers on helping new teammates, players around NFL acclimate to unique circumstances
JC Tretter: NFL would've canceled Browns-Raiders game if not for union