Chukwuemeka is out of contract next summer with talks over a new deal having stalled amid interest in the 18-year-old from Barcelona and Borussia Dortmund. However, Villa's board remain hopeful of securing him to a new contract.
“If they lose him, it's not ideal," he said.
“But if you set that standard of giving young players whatever they want because they've got a chance of being great, it can be dangerous.
“It's what all clubs fear. When a young player, who could go on to become a really big star, but nobody knows, so you can't give him money he doesn't deserve yet."