The Buffalo Bills were set to begin their 2020 offseason program next Monday, April 20. They’ll still be able to do that, but everything they do will have to be conducted virtually with no on-field activities allowed.
Due to the COVID-19 pandemic, the league and its players union have agreed to a modified offseason program, outlined in a series of tweets by NFL Network's Tom Pelissero: 
-------------- offseason coming soon... pic.twitter.com/ql68VgQqVu
— NFLPA (@NFLPA) April 13, 2020ESPN's Adam Schefter obtained a copy of the memo sent out by the league to all 32 teams:
Virtual off-season now officially approved, and this went to all teams after players approved it to lay out new off-season guidelines. pic.twitter.com/R4Fm1L5jCn
— Adam Schefter (@AdamSchefter) April 13, 2020