Satish Sehgal said he would continue to take to the stages to praise the institution of the monarchy and Thailand in the face of the deportation threat.
The president of the India-Thai Business Association was speaking to the public for the first time at Pathumwan intersection after the Centre for Maintaining Peace and Order on Monday decided to deport him for joining the People's Democratic Reform Committee (PDRC).
The centre said on Monday that it would direct the Immigration Bureau to remove his right to stay in Thailand.
Mr Satish said on the same day that he had already ended his participation after the state of emergency.
Asked by Chermsak Pinthong on the stage on Thursday about the deportation, he said there could be a fallout for Thailand instead not him as the country could lose trade, investment and tourism opportunities with emerging India.
Mr Satish was an advisor to many former ministers, including the administration run by Thaksin Shinawatra and Chuan Leekpai, and has been involved in trade and business negotiations.
He has lived in Thailand for more than 50 years.
PDRC leader Suthep Thaugsuban stepped on to the stage to give him moral support and praised his loyalty to His Majesty the King.
''In the case of Mr Satish Sehgal, I didn't know that he was not a native. I've been impressed wih him since he was on our stage back at Samsen because of the way he showed his loyalty to our king,'' he said.
Mr Suthep said he had planned to show sympathy and give him support in person on behalf of all demonstrators, but Thursday night was an opportunity to do it in public as he was on the stage.