The midfielder has been sidelined since suffering an injury during the first leg of the UEFA Europa League semi-final against Nottingham Forest.
He has since missed matches against Tottenham Hotspur, the Europa League return leg and last weekend’s trip to Burnley.
Onana joins Alysson and long-term absentee Boubacar Kamara on the injury list with Villa boss Unai Emery providing an update on the squad during Thursday’s pre-match press conference.
“We have the same players out,” he said.
“Amadou Onana is not available for tomorrow, Alysson as well is not, Kamara as well is not.
“But other players should be ready to play tomorrow.”
