NFLPA warns players to prepare for possible work stoppage in 2021Players should plan ahead for 'a work stoppage of at least a year in length'5/28/2019, 10:59 PMJan 31, 2019; Atlanta, GA, USA; NFLPA executive director DeMaurice Smith speaks during the NFLPA press conference in advance of the Super Bowl LIII where the New England Patriots will play the Los Angeles Rams on Feb. 3, 2019 at Mercedes_Benz Stadium. Mandatory Credit: John David Mercer-USA TODAY Sports / John David Mercer