NFL's new COVID-19 rules include changes to return-to-play protocols, return of intensive restrictions - ESPN
Implementation and Evolution of Mitigation Measures, Testing, and Contact Tracing in the National Football League, August 9–November 21, 2020
NFL considers changes to its protocol due to COVID-19 Delta variant
Getting to January a major challenge for NFL as Covid-19 ravages team rosters
Why the NFL is upset with the Titans and why teams are mad at the league office - Sports Illustrated
NFL looking at several protocol incidents with Titans
Virus outbreak pushes Steelers-Titans to Monday or Tuesday
Titans could face discipline if review finds they did not follow COVID-19 protocol
Fourth Titans Player Tests Positive for COVID-19
New COVID-19 protocols to feature targeted testing of fully vaccinated players, staff
NFL 2021 season: What's happening with the league's business
NFL changes postseason roster rule as COVID-19 cases increase around league
NFL postpones Titans-Steelers ame after positive Covid-19 tests