The outbreak threatened to jeopardize the Titans' game this weekend against the Pittsburgh Steelers.
The NFL issued a statement Tuesday saying both the Titans and Minnesota Vikings suspended in-person activities Tuesday following the test results. The Titans beat the Vikings 31-30 in Minneapolis last weekend.
"Both clubs are working closely with the NFL and the NFLPA, including our infectious disease experts, to evaluate close contacts, perform additional testing and monitor developments," the NFL said.
A person familiar with situation told The Associated Press the eight test results were all confirmed positives, making this the first outbreak since the season began. The person spoke to the AP on condition of anonymity because of health privacy regulations.
The Vikings released a statement saying they had not received any positive results from their testing after Sunday's game against the Titans. They also said they followed NFL protocol by closing their facility immediately and were working to determine when they can reopen.
After multiple positive COVID tests in their organization , the Titans are halting in-person work today and made this announcement: pic.twitter.com/2LDjIBgyor— Adam Schefter (@AdamSchefter) September 29, 2020
The Titans (3-0) are scheduled to host the Steelers (3-0) on Sunday in a matchup of two of the league's seven remaining undefeated teams. With the Titans not able to practice until Saturday at the earliest, when that game might be played is unknown.
"All decisions will be made with health and safety as our primary consideration," the NFL said. "We will continue to share updates as more information becomes available."
Spokesman Burt Lauten said the Steelers have been in contact with the NFL about the Titans' positive tests.
"We have been informed to proceed with our game preparations for Sunday's game until we are informed otherwise," Lauten said in a statement.
Steelers defensive tackle Cam Heyward wrote on Twitter that the guys playing the next week now wind up affected.
"This is wild but this is the world we live in now," Heyward wrote.
The Titans initially announced Tuesday morning that they would be working remotely "out of an abundance of caution" after several test results came back positive. They beat the Vikings in Minneapolis without outside linebackers coach Shane Bowen, who did not travel with the Titans following a test result Saturday.
Coach Mike Vrabel said Monday that Bowen was not with the team. Rookie offensive lineman Isaiah Wilson, their top draft pick out of Georgia, also has been on the reserve/COVID-19 list for the Titans since Sept. 6.
AP Pro Football Writer Dave Campbell in Minneapolis and AP Sports Writer Will Graves in Pittsburgh contributed to this report.