SANTA CLARA — Kendrick Bourne’s positive COVID-19 test from Tuesday has spawned more trouble.

A NFL investigation revealed a potential violation from the 49ers wide receiver for not wearing his protective face covering properly or frequently, a league source told this news organization this morning.

The 49ers are, thus, subject to discipline such as a fine. The team had no comment on the investigation’s findings.

Today’s batch of COVID-19 test results revealed no positive results from Bourne or any other 49ers, a league source said.

Still, Bourne and three players identified as high-risk close contacts remain out for tonight’s game against the Green Bay Packers, per COVID-19 safety protocol agreed upon by the NFL and NFL Players Association. Those close-contact players are left tackle Trent Williams and wide receivers Brandon Aiyuk and Deebo Samuel.

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Those four players must remain away from the 49ers until at least Sunday, a five-day span dating back to Bourne’s positive test.

Bourne’s agent, Henry Organ, claims that Bourne had a false positive result. The NFL disputed that, noting there have been 104 times an individual tested positive one day and negative the next, and 101 times that individual indeed turned out to be positive.

Bourne continues to have no coronavirus symptoms and has isolated at his home since Wednesday, according to Organ, who noted that Bourne’s roommates all have tested negative for COVID-19.

The 49ers have zero players on the NFL’s COVID-19 reserve list all season until Bourne on Wednesday, followed by those three close-contact teammates.

Earlier this week, after COVID-19 issues that hit the Packers and Baltimore Ravens, the NFL advised teams to have players wear masks on the sideline and in the locker room, and that benches be spread out further between the 20-yard lines during games.