AP -- The NFL has expanded its mandate for mask usage on the sideline and is threatening discipline for those who violate the league's updated COVID-19 protocols. The league told teams in a memo on Monday that players who are not substituting or preparing to enter the field of play and are not wearing their helmets will be required to wear a mask or a double-layered gaiter on the sideline, starting this week.

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Play-callers now must wear a mask even if they have a face shield. Postgame interactions between players and staff will be limited. Also, players and team personnel must wear masks and may briefly greet opponents after games.

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