Beginning on Saturday, all NFL teams must operate under the league's intensive COVID-19 protocols for the remainder of this season, according to a league memo.

Requirements under the intensive protocols, which 28 of the league's 32 teams have already experienced at some point this season, include virtual team meetings and the wearing of masks by all players and staff at all times while at the facility, including during practice.

The league said it made the decision to impose the intensive protocols leaguewide because of the heightened recent spread of COVID-19 around the country as well as the data it has been collecting all year regarding close contacts.