The World Cup has highlighted a potential issue with turf in NFL stadiums, with some outlets suggesting it may be a factor in player injuries. The use of grass fields in the World Cup has sparked a debate about the field surface in NFL stadiums, with some players and teams reportedly considering a switch from turf to grass. It is unclear whether any NFL teams will make changes to their stadiums, but the issue is being discussed in the context of player safety and potential changes to the collective bargaining agreement.