The testing results returned Thursday morning were confirmed by a person familiar with the situation.
The Titans' outbreak increased to 23 on Thursday with 21 positive results returned since September 29.
The first outbreak on an NFL team is not abating, and the league must deal with its most complicated scheduling crisis yet. Even if it is a positive, the National Football League doesn't necessarily need to adjust the scheduled game Sunday with Arizona.
As it gets later into the 2020 NFL season, the league will be faced with less options in regard to the potential movement of games.
The New England Patriots also had no new positive tests from Thursday, a source told ESPN's Adam Schefter, meaning the Patriots' game against the Denver Broncos remains on for Monday. This would add bye weeks for teams with postponed games. The game will still be played at Gillette Stadium.
NFL Commissioner Roger Goodell told teams in a memo Monday that any violations of protocols resulting in schedule adjustments or affecting other teams could result in game forfeits or the loss of draft picks.
The Pittsburgh Steelers (3-0) take on the Philadelphia Eagles on Sunday while Mahomes and the Chiefs, who improved to 4-0 with Monday's win over New England, are due to host the Las Vegas Raiders.
The NFL is investigating the Titans for their COVID-19 outbreak.
The Titans are trying to get into their facility by Saturday afternoon, a source said. According to multiple reports, Titans players worked out September 30 at a private school in Nashville.
"As of now, it's business as usual", Arizona coach Kliff Kingsbury said. According to one of those people, the player's test was being rerun after a positive result on a point-of-care test accompanied by a negative result on regular daily testing. One of the two positive results Wednesday morning turned out to be inconclusive later Wednesday.
Tennessee now has 13 players on the reserve/COVID-19 list, including four starters and a long snapper. That list is for players who test positive or are found through contact-tracing to have been exposed to the virus.
The Bills had been preparing and practicing all week for a Sunday game in Nashville. That game had been postponed from Sunday because of positive tests for both teams. A hypothetical Week 18 matchup was discussed as a possibility on social media. Newton was reportedly asymptomatic as of Monday and Gilmore said he was asymptomatic following Wednesday's diagnosis. The Patriots placed practice squad defensive lineman Bill Murray on their covid-19 reserve list Tuesday.
Patriots coach Bill Belichick said Thursday the health and safety of his players remained paramount. I'm sure you have a lot of questions, and I have a lot of questions.
The Patriots are to play the Denver Broncos on Sunday in Foxborough, Mass.