The Army has been asked to put military police units on standby after widespread protests struck Minneapolis over the death of George Floyd.
Soldiers from North Carolina and New York have been told to be ready to deploy within four hours as authorities look to quell disorder across a number of US cities.
Protests over the death of Mr Lloyd, who had a knee pressed into his neck while being detained, have descended into looting and arson in some areas.
The get-ready orders were sent verbally on Friday, after US president Donald Trump asked defence secretary Mark Esper for military options to help quell the unrest in Minneapolis.
Police officer Derek Chauvin, 44, was charged with third-degree murder and second-degree manslaughter after the death of Mr Floyd who begged for air while being arrested on Monday.
A source said the military units would be deployed under the Insurrection Act of 1807, which was last used in 1992 during the riots in Los Angeles that followed the Rodney King trial.
Rioters set fire to the Minneapolis Third Police Precinct near where Mr Floyd was arrested on Thursday and Mayor Jacob Frey ordered a citywide curfew at 8pm beginning on Friday.
The unrest has since spread across the country with protests, some violent, erupting in cities including Washington DC, Atlanta, Phoenix, Denver and Los Angeles.
Minnesota Governor Tim Walz ordered 500 of his National Guard troops into Minneapolis, St Paul, and surrounding communities.
But a Pentagon spokesman said Mr Walz did not ask for the Army to be deployed to his state.
He said: “The Department has been in touch with the Governor and there is no request for Title 10 forces to support the Minnesota National Guard or state law enforcement.”
Title 10 is the US law that governs the armed forces, and would authorise active duty military to operate within the US.
Alyssa Farah, the White House director of strategic communications, said the deployment of active-duty military police is untrue.
“False: off the record – title 10 not under discussion,” Ms Farah in an email response.