The Denmark international is training with the under-21s after Black said he refused to be on the bench for the 2-1 defeat to Bournemouth earlier this month.
But Okore took to Twitter to claim there was more to his omission than Black, who replaced Remi Garde last month, had suggested.
He wrote: "I refuse to play?, I was on the bench against Chelsea and the games before, why didn't I refuse to play those games?
"There must be more to it than Eric Black is telling you!"
Black had previously said Okore told him he did not want to play for Villa after failing to make the starting XI against the Cherries.
"It wasn't a disagreement. I spoke to Jores the week beginning the Bournemouth game and I thought he responded well and thought he trained extremely well," he said.
"But once I named the XI on the Friday, Jores asked to see me and said that he didn't want to be considered to be on the bench, which I found surprising.
"I withdrew him from the squad. I met him again on the Monday
He said he didn't want to be considered for any of the games going forwards."
Source: PA