Manager Tim Sherwood has provided a fitness update on his squad ahead of Sunday's visit of Burnley.
Richardson has not trained since missing last weekend’s 6-1 defeat at Southampton with a calf injury, as Alan Hutton deputised at left-back, while Okore has been playing through the pain barrier due to a knee problem which has plagued him for several games.
The Dane has also failed to train this week and, while Sherwood has hailed him as a “great warrior”, he believes it would be a big ask for him to feature in the Clarets clash.
Speaking on the pair’s fitness issues, the Villa boss said: "Kieran has still not trained. He has a calf injury. I am led to believe it's not that bad. But he did miss last weekend too.
"Jores has not trained this week. He will struggle. There's some great warriors in there - guys who have serious injuries but not serious enough to keep them out for the cause.
"They have been going through the pain barrier. That's what fans would expect them to do but not everyone would do that. They deserve a lot of credit for that, Jores Okore and Ron Vlaar especially."
There has been talk this week that Sherwood could rest some of his star names ahead of the FA Cup final against Arsenal, with the likes of Christian Benteke, Fabian Delph and Jack Grealish obvious candidates to be left out.
However, while rookies Callum Robinson, Lewis Kinsella, Andre Green, Rushian Hepburn-Murphy and Riccardo Calder are all rumoured to be in contention for bench spots, the manager insists that he will be putting out a strong line-up at Villa Park.
"If the lads are struggling, they won't play. If they're fit they will play,” added Sherwood. "They all want to play and I want them to play. It's right to get that momentum.
"There will be no resting of players. We're looking to go out with a win."