NFLPA files grievance against Panthers for field conditions
Chicago Bears not thrilled with likely Vikings venue
Rodgers, NFL players urge league to nix turf, go with grass
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Detroit Lions still haven't solved ground woes, on offense or defense
Dan Campbell talks Ford Field turf change
Source - NFLPA filing grievance over hardness of Panthers' turf
NFLPA files grievance against Panthers for field conditions
Detroit Lions say they don't think field conditions in Carolina