The minister's remarks come after an archaeological probe found a Buddha sculpture in a temple in Tamil Nadu's Salem.
Modi, who was in the Himalayan nation at the invitation of Deuba, visited Lumbini for the first time. This was his fifth visit to Nepal since 2014.
Modi, who is in the Himalayan nation at the invitation of Deuba on a day-long visit to Lumbini on the occasion of Buddha Purnima, met Deuba after offering prayers at the sacred Maya Devi temple here.
Recently, Omnipresent was selected as a beneficiary under the government's PLI (Production-Linked Incentive) scheme for drones and drone components.
The idol would cost around Rs 30 lakh, said SP S Rajendra Prasad.