Accompanied by his lawyer, 75-year-old Ferreira turned up before the Economic Offence Wing (EOW), following Wednesday's directive by a sessions court to present himself for questioning today.
The court, which is hearing his anticipatory bail plea, had also granted him interim protection from arrest till January 31, when his application would be taken up again.
Emerging from police headquarters after questioning, Ferreira said, "I was not missing and came here to co-operate with the ongoing investigation."
Responding to reporters' questions, Ferreira trashed suggestions that he had been trying to acquire foreign citizenship.
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"I have not applied for any citizenship abroad, these are wrong reports. I have given all my years for this country, why should I apply for citizenship abroad. I am a proud Indian," he said.
The ace cueist will be called for questioning again in the next few days, an EOW officer said.
Mumbai Police had on January 2 issued a lookout notice against Ferreira after he failed to appear before them despite summons in the second week of December asking him to turn up and explain his association with the company.
QNet has also been accused of using the banned binary pyramid business model for their multi-level marketing (MLM) schemes to lure investors. The accused have been charged with cheating and forgery under relevant sections of the Prize, Chits and Money Circulation Schemes (Banning) Act 1978.
Ferreira had earlier denied any wrongdoing and also defended the controversial company.
In his anticipatory bail plea, Ferreira said the complaint did not show commission of any offence by him.
He had said any offence under sections of Prize, Chits and Money Circulation Schemes (Banning) Act also cannot be made against him as he did not promote or conduct any prize chit or money circulation scheme.
The EOW has arrested nine team leaders of QNet in connection with the alleged scam so far.