NFL players union sees no need for bubble if people follow protocols - The Boston Globe
NFLPA president JC Tretter latest Cleveland Browns player to test positive for COVID-19 - ESPN
Getting to January a major challenge for NFL as Covid-19 ravages team rosters
JC Tretter: Brown center on NFL in coronavirus world
Browns starting C Tretter sidelined after procedure on knee - The San Diego Union-Tribune
Cleveland Brown JC Tretter tests positive for COVID-19; two activated
Browns center, NFLPA president JC Tretter calls for end to NFL's offseason practices
NFL medical officer: Asymptomatic people not spreading COVID