A San Francisco 49ers player, reported to be wide receiver Kendrick Bourne, has tested positive for coronavirus ahead of Thursday's game with the Green Bay Packers.

The 49ers confirmed the positive test in a statement on Wednesday, potentially throwing the game at Levi's Stadium into doubt.

"The San Francisco 49ers were informed today that a player has tested positive for COVID-19 and the individual immediately went into self-quarantine," their statement read. 

"Our organisation has entered the NFL's intensive protocol and we are working with the league on contact tracing to identify high-risk individuals. All team functions will be conducted virtually today.

"The health and safety of our players, staff and community are the organisation’s highest priority. We will continue to work closely with the NFL and medical professionals and will follow their direction."

Matt Barrows of The Athletic reported Bourne's agent confirmed his client had tested positive, saying the receiver had no cough and was feeling "fine".

On Monday, Packers running back AJ Dillon tested positive for COVID-19 following his participation in their loss to the Minnesota Vikings.

That defeat dropped Green Bay to 5-2 ahead of the rematch of last season's NFC Championship game, which the Niners won 37-20 before losing Super Bowl LIV to the Kansas City Chiefs.

The 49ers, who have 12 players on injured reserve, are 4-4 and could be without starting quarterback Jimmy Garoppolo (ankle) and star tight end George Kittle (foot) for the rest of the season.

Bourne's absence, if the game goes ahead, would leave the Niners thin at wide receiver with Deebo Samuel also set to miss out with a hamstring injury.