The Jacksonville Jaguars and New York Jets each lost key defensive players a few hours before kickoff of their game at MetLife Stadium.

Jacksonville placed linebacker Myles Jack on the COVID-19 list and New York put defensive lineman Quinnen Williams on the list Sunday.

Jack joined pass rusher Josh Allen, wide receiver Laviska Shenault and guard Ben Bartch, who were placed on the reserve list Friday. They didn’t make the trip to New Jersey. Allen, who is unvaccinated, will be out at least 10 days, according to current NFL protocol, and will miss the team’s game Jan. 2 at New England.

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Williams is the latest loss for a Jets team hit particularly hard by a surge of COVID-19 cases. There were 20 players on the active and practice squad rosters — including injured reserve — on the COVID-19 list as of Sunday morning.

Jets coach Robert Saleh was ruled out for the game Saturday because he didn’t clear COVID-19 protocols Saturday. Tight ends coach Ron Middleton is assuming the head coaching duties.

Saleh tested positive for the coronavirus Wednesday and needed to have two negative tests by Saturday afternoon to return to the sideline. The coach has been quarantining in a hotel while running team meetings remotely.

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Jets quarterbacks coach Rob Calabrese will also miss the game because of COVID-19 protocols. Senior offensive assistant Matt Cavanaugh is assuming Calabrese’s game-day duties.

The Kansas City Chiefs have ruled out Pro Bowl tight end Travis Kelce, starting linebacker Nick Bolton and starting right tackle Lucas Niang on Sunday against the Pittsburgh Steelers.

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The three players tested positive for COVID-19 last week and missed every practice, but the Chiefs had activated each from the list by the Saturday afternoon deadline to give them a chance of playing at home against Pittsburgh. All three needed to pass protocols on Sunday morning, though, and none did.

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The Chiefs did get some good news Saturday when wide receiver Tyreek Hill tested out of protocol. He didn’t practice all week and is expected to start as usual against the Steelers.