*UPDATE (12 p.m. ET): The Patriots and Chiefs have set a 7:05 p.m. ET kickoff for their Week 4 game Monday night at Arrowhead Stadium, the NFL confirmed Sunday.
The Packers' Monday night game against the Falcons also has been bumped from 8:20 p.m. ET to 8:50 p.m.
"Further testing of players and personnel on both teams returned no new positives from Saturday and Sunday testing," the NFL said Sunday in a statement.
"The clubs also worked closely with the NFL and NFLPA and infectious disease experts to conduct contact tracing and post-COVID exposure protocols are now in effect for both teams.'
-- End of update --
The NFL is moving full speed ahead on trying to play Patriots-Chiefs in Week 4.
After receiving no new positive COVID-19 tests Saturday, New England took another round of tests Sunday morning that all came back negative, ESPN's Adam Schefter reported Sunday.
If Kansas City returns all negative test results Sunday, as well, the teams will try to play their Week 4 contest -- originally scheduled for 4:25 p.m. ET on Sunday -- Monday night at Arrowhead Stadium, per Schefter.
That would mean the Patriots flying to Kansas City on Monday morning and playing later that night, but according to NFL Media's Ian Rapoport, both teams would prefer to play Monday rather than Tuesday or another time in the season.
The Patriots and Chiefs added one player each to their COVID-19/reserve lists Saturday. Per multiple reports, those players were New England quarterback Cam Newton and Kansas City practice squad QB Jordan Ta'amu.
Neither team has had a positive test since Newton and Ta'amu reportedly tested positive Friday, though, and both players are self-quarantining.
The Patriots will all need to pass one more point-of-care test Monday morning before flying to Kansas City, per Sports Illustrated's Albert Breer. But if that happens, the teams could maintain some sense of normalcy in their schedules by playing Monday night in Kansas City.