Agbonlahor has been placed on a two-week fitness programme, as Villa look to get the striker back in peak physical shape.
The 29-year-old is considered to be way short of fitness, and Black has told the striker that he needs to get back in shape if he is to get back in Villa’s team.
The action comes when there are just five games remaining in the Claret and Blues season, meaning that Agbonlahor may not play for the club again this campaign.
And Black admitted: “You will have your own opinions on that and the fans will have their opinion
“I can only speak about since I have been in charge and I feel we have to improve that if we’re going to get anything out of him.
“It’s hard to play in the Premier League week in, week out.
“People might ask why I am doing it near the end of the season but while I am in this position I am going to treat it the way I’m going to treat it.
“So if they don’t want to train properly, or be part of the group, or be ready to perform in training or in the games this is the only sanction I’ve got.”
Agbonlahor’s future at Villa is now firmly in doubt, as the club plan for life in the Championship.
The rapid front man is one of the Claret and Blues’ top earners, and he could be part of the group of players that depart Villa Park over the summer transfer window.
Agbonlahor has been at Villa for his entire career so far, but his role has diminished in importance in recent times.
Agbonlahor has played 18 times for the Villains this season, but he has only hit the back of the net once.