Linsley earning Packers' confidence, respect
JC Tretter announces retirement from NFL action
NFL playing surface debate reignites: 'Grass is the way to go, by far'
NFLPA president JC Tretter says 'hurdles' remain before NFL's return
JC Tretter retires after interest in playing for Vikings, other teams
Why did JC Tretter retire? NFLPA president and former Browns
Packers Release Derek Sherrod, Activate J.C. Tretter from Short
NFL faces intense scrutiny over concussion protocols
Rodgers, NFL players urge league to nix turf, go with grass
JC Tretter: Brown center on NFL in coronavirus world