The Villans closed their Bodymoor Heath training ground on Thursday afternoon after a number of players and staff returned positive Covid-19 tests.
That forced the cancellation of a pre-Liverpool training session, seemingly putting tomorrow evening's game at risk.
Discussions between the club, the FA and Premier League are ongoing, with no decision yet made over whether the fixture will be called off.
With their weekends and midweeks prior to the FA Cup fourth round already filled by Premier League games, it would be difficult for Villa to reschedule in the case of a postponement.
Consequently, Liverpool could be handed a bye into the next round or face a team comprised of youth players at Villa Park.
"Final confirmation will be made tomorrow pending the results of additional COVID-19 testing."