J.C Tretter: 'Only Natural Grass Can Level The NFL's Playing Field' - Sports Illustrated Cleveland Browns News, Analysis and More
NFLPA president calls for league 'to re-evaluate what is an acceptable surface' after preseason opener in Chicago - ESPN
Soldier Field's grass surface is once again a talking point for Bears, NFL
Browns center, NFLPA President JC Tretter wanted to make sure players had option to opt out
JC Tretter: Brown center on NFL in coronavirus world
NFLPA President JC Tretter Wants NFL Using All Grass Fields to Lower Injury Risk, News, Scores, Highlights, Stats, and Rumors
NFLPA president JC Tretter calls for all teams to use grass fields - ESPN
The NFL cast JC Tretter out; the NFLPA president says that only makes him more powerful - Sports Illustrated
NFL Players Association president calls for grass surfaces to be used, NFL News
The NFL cast JC Tretter out; the NFLPA president says that only makes him more powerful - Sports Illustrated
NFL Players Association president calls for grass surfaces to be used, NFL News
Browns center JC Tretter shoulders heavy responsibility of protecting players as president of NFL union
NFL stadiums by grass type