Members of the Minnesota Vikings kneel during the national anthem before the start of their game against the Tennessee Titans on Sunday in Minneapolis. The Titans defeated the Vikings 31-30. (AP photo)

The outbreak threatened to jeopardize the Titans’ game this weekend against the Pittsburgh Steelers and posed the first significant in-season test to the league’s coronavirus protocols.

The NFL issued a statement Tuesday saying both the Titans and Minnesota Vikings suspended in-person activities Tuesday following the Titans’ 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 league 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 on Sept 10. The person spoke to the AP on condition of anonymity because of health privacy regulations.

Tennessee Titans defensive tackle Larrell Murchison looks on before the start of a game against the Minnesota Vikings, Sunday, Sept. 27, 2020, in Minneapolis. The Titans defeated the Vikings 31-30. (AP photo)

The Vikings released a statement saying they had not received any positive results from their testing after Sunday’s game against the Titans and followed NFL protocol by closing their facility immediately. They will remain closed at least through today. They also scheduled a video conference call this morning with GM Rick Spielman and head athletic trainer Eric Sugarman.

Minnesota is scheduled to visit Houston (0-3) on Sunday.