Baltimore Ravens quarterback Lamar Jackson tested positive for COVID-19 on Thursday, sources confirmed to ESPN.

The reigning NFL MVP is the biggest star player to become infected in what has become one of the largest outbreaks in the NFL.

Jackson is among the four latest Ravens players and one staff member to test positive on Thursday, a source told ESPN’s Adam Schefter. The Ravens now have had at least a dozen players test positive for the coronavirus this week.

This latest round of positive tests could threaten Sunday’s game between the Ravens and the undefeated Pittsburgh Steelers, which already was postponed from Thursday night. Ravens coach John Harbaugh told players that they would not be allowed back to the team facility until Monday at the earliest in the interest of safety, a source said.

As of Friday morning, there has been no change in the status of the game and the league continues to monitor the situation, a source told ESPN’s Jeremy Fowler. The NFL is trying to determine whether playing the game would be medically safe after five straight days of positive tests in Baltimore, and whether that could subside over the weekend.

Baltimore is down to two healthy quarterbacks: backup Robert Griffin III and practice squad player Tyler Huntley. No. 3 quarterback Trace McSorley is currently on the reserve/COVID-19 list.

Got a story or tip for us? Email Sports Gossip editors at tips@sportsgossip.com 

Want More From Sports Gossip? 

For all the latest breaking Sports Gossip, be sure to follow SportsGossip.com on FacebookInstagram, and Twitter.