The Denver Broncos face a crisis after all four of their quarterbacks were reportedly ruled out of Sunday's NFL game with the New Orleans Saints due to coronavirus.

Broncos reserve Jeff Driskel was put on the reserve/COVID-19 list on Thursday, as a player who has either tested positive or been in close contact with somebody carrying the virus.

Denver head coach Vic Fangio said at the time that no other players would need to join Driskel on the list.

According to the Broncos website, Fangio stressed on Thursday that the quarterbacks had all been cleared, saying they had only been on the contact-tracing list for "minimal amounts" of time.

Fangio declared that NFL officials "came back and said nobody else needs to go on the list".

However, ESPN and NFL Network both reported on Saturday that Broncos quarterbacks Drew Lock, Brett Rypien and Blake Bortles would all have to miss the Saints clash.

NFL Network said all three were pulled out of practice on Saturday for evaluation.

ESPN's Adam Schefter cited an unnamed source as saying the fellow quarterbacks had not been wearing face masks when in Driskel's company and were therefore considered high-risk contacts.

There was no immediate comment from the Broncos.

The Broncos (4-6) sit third in the four-team AFC West, behind leaders and Super Bowl champions the Kansas City Chiefs (9-1), while the Saints (8-2) top the NFC South.