The trio joins Byron Cowart and James Ferentz as Patriots now on the COVID-19 reserve list.
If the Patriots and Broncos do play, New England will be without Ferentz and Mason, who both would have started on the offensive line.
The Broncos have not played since the win over the Jets, and the game against the Patriots has already been moved twice on the schedule because of multiple positive COVID-19 tests among the Patriots players and coaches over the past two weeks. "And anything that happens otherwise will happen when it happens".
Gilmore, the reigning Defensive Player of the Year, and Newton returned to practice this week for the first time since testing positive. Newton missed New England's loss at Kansas City after his October 2 positive test.
Too, This Friday, the Colts closed their facilities after receiving four positive tests for COVID-19 Within the team, however, hours later they announced that subsequent tests on those samples had returned negative and the team returned to training in the afternoon.
The league also said last week that, with cold and flu season at hand, it expected more players and coaches to be withheld from practices and games for displaying symptoms, even if that is accompanied by a negative coronavirus test.
The Broncos (1-3) haven't played since October 1.
Rookie defensive tackle Marlon Davidson was placed on the COVID-19/reserve list Tuesday and the second person, who is not a player, subsequently tested positive. Which is why the National Football League must be breathing a major sigh of relief on Sunday that they don't have to make any more adjustments to their schedule - for now, at least.
An NFL spokesman told Denver7 that the Broncos' game is unchanged despite Modkins' positive test. Three teams - the Saints, Steelers and Buccaneers - had byes when play resumed a week later, so they all had 20 days between games that year.
In addition, defensive end Rashod Berry, receiver Isaiah Zuber and defensive tackle Nick Thurman have been elevated as specific COVID-19 replacements for Sunday's game.
Despite a week of facility closures and positive tests, games involving the Patriots, Falcons, Ravens, Eagles, and Broncos are going forward.
Of those three teams, only the Steelers won in their return to action.
Ferentz was also a full participant in Thursday's practice. The team isn't saying if he tested positive or came in close contact with someone infected. And he was on track to play Sunday against the Patriots before showing up ill Friday.