Baltimore Ravens quarterback Lamar Jackson tested positive for COVID-19 on Thursday, a source confirmed to ESPN.
The reigning NFL MVP is the biggest star player to become infected in what has become one of the biggest 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.