Rao is at the centre of a controversy involving Bhandari, who is being probed for allegedly buying a benami house for Robert Vadra in London.
"If anyone has clandestine deal with me, I want to know how they had it. It is my job to see that there is nothing clandestine going on, it is simply that. As long as I have confidence in him (Rao), he is there because he is my appointee," Raju told news channels.
"If you have an allegation, please give it. If you say a person has talked over phone, that is verifiable... We are for zero corruption. If you have a corruption charge, please tell us. I am not going to encourage corruption much less in my personal staff".
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According to investigation agencies, Bhandari was constantly in touch with Rao, who is Raju's Officer on Special Duty (OSD), and allegedly made some 355 calls to him, a charge denied by Rao who insisted that the relationship was only "professional".
"First of all so many calls would not have been there, I tell you. It was a professional relationship..He (Bhandari) came to meet the minister 3-4 times, in the last one-and-a-half years. ..It was only a professional relation.
"We got an acquaintance for the first time at the Bangalore Air show. He (Bhandari) had invited the minister to see his stall. Minister went and saw it. I don't have any personal relationship," Rao said.