NFL changes postseason roster rule as COVID-19 cases increase around league
Here's how the NFL tackled the spread of COVID-19 among players, staff
Implementation and Evolution of Mitigation Measures, Testing, and Contact Tracing in the National Football League, August 9–November 21, 2020
NFL alters the COVID-19 protocols to help players return faster
NFL Overhauls Covid Rules to Tame Outbreaks—and Get Players Back Faster - WSJ
How COVID-19 vaccine hesitancy among players is affecting NFL teams - Sports Illustrated
Amid COVID surge, NFL alters rules to allow players quicker return
Miami Dolphins place four players on reserve/COVID-19 list - The Phinsider
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