Villa's top scorer has been the talk of a transfer window move to Arsenal but O'Leary insists the Colombian forward is staying at Villa Park.
"If Juan is linked to a club like Arsenal, it is a big compliment to him because they are one of the biggest clubs," said O'Leary.
"I hope in the future many more of our players are linked with big clubs because it means they will be good players.
"Is he staying here? Without doubt, he wants to stay here. That is what he has indicated to me when we have talked."