NFL free agents 2020: Re-signing J.C. Tretter should pay for Browns, considering available centers
Cleveland Browns News: J.C. Tretter claims NFL tried to change deal with NFLPA
Cleveland Browns' NFL free-agent signings 2022: Jakeem Grant gives Browns much-needed return threat - ESPN - Cleveland Browns Blog- ESPN
JC Tretter retires after interest in playing for Vikings, other teams went unreciprocated - Sports Illustrated Minnesota Vikings News, Analysis and More
5-year Browns center JC Tretter announces retirement
JC Tretter: Brown center on NFL in coronavirus world
Confident rookie Nick Harris filling in for injured Browns center JC Tretter – News-Herald
NFL free agents 2020: Re-signing J.C. Tretter should pay for Browns, considering available centers
Browns release JC Tretter, turning to Nick Harris at center
NFL players union sees no need for bubble if people follow protocols - The Boston Globe
Cleveland Browns release center JC Tretter, save $8.25 million against salary cap - ESPN
JC Tretter's busy offseason centers on helping new teammates, players around NFL acclimate to unique circumstances
Cleveland Browns' 2020 NFL free-agent signings: Hooper, Conklin, Keenum join loaded offense - ESPN - Cleveland Browns Blog- ESPN