The hosts have been hit by allegations of ball-tampering ahead of their high-voltage semifinal, slated to be held here tomorrow against South Africa.
"If they are doing something funny with the ball, then it's definitely a concern, yes, but we've got no proof of that. Look, they seem to get it to reverse a bit quicker than the rest of the teams so maybe they've just got really good skill in their bowlers," de Villiers told reporters on the eve of the match.
"It's something that the umpires and the ICC will probably look into why England and some of the other teams might get it to reverse quicker. All that is really not up to me to decide or to comment on that. But if there is something funny happening, then it's definitely a concern, yes," he added.
Even as Dale Steyn's availability for the match remained in doubt, de Villiers asserted that they have enough firepower to emerge victorious without the world's numero uno fast bowler.
"I said before that I don't believe we're lost without him.