Mark Hughes, a former No 2 at the Bahrain circuit, in accuse of building the Indian facility for the past 12 months, quit last month "due to personal reasons", the promoters said.
"Mark Hughes is no longer working with us, he gone due to his own personal reasons," Sameer Kumar, chief spokesman for the promoters, the Jaypee group, said.
Kumar did not complicated on Hughes's sudden departure, but said operations at the circuit were now being handled by Azhar Ghazali, a former race organiser in Sepang, Malaysia.
"Mr Ghazali is a very competent man and he's more than making up for Mr Hughes's absence," said Kumar.
India is due to hold the race on October 30 at an under-construction $350 million 5.14-kilometre circuit designed by famous German architect Herman Tilke in Greater Noida on the border of New Delhi.
The circuit is part of an ambitious 2 500-acre (1 000-hectare) sports complex being built by the Jaypee group that will comprise an international-standard cricket stadium.
Hughes established the development, telling AFP he was now working with the Yas Marina Circuit in Abu Dhabi, United Arab Emirates.
"While I am no longer based in India and I am working for the circuit in Abu Dhabi, I am still closely linked with Jaypee and am still advising them on the upcoming Indian Grand Prix," he said.
