Retired center JC Tretter claims Minnesota Vikings 'never returned our call'
NFLPA President criticizes league on vaccine wristbands
Tretter elected NFLPA president
JC Tretter, former Cleveland Browns center, retires after 8 seasons in NFL but remains NFLPA president - ESPN
NFLPA Elects J.C. Tretter As President
Former Browns C JC Tretter Announces Retirement, 'Doubling Down' In Role As NFLPA President - Steelers Depot
Cleveland's J.C. Tretter Elected President of N.F.L. Union - The New York Times
4 lessons NFL players can learn from this messy CBA process