Joy, who served as an official adviser to the former prime minister until Monday, said in an interview with a British public service broadcaster's Newshour program that Sheikh Hasina had been contemplating resignation since Sunday and had left the country for her safety following pressure from her family.
Sheikh Hasina's removal as Bangladesh PM amid scenes of violent protests have sparked discussions about foreign interference behind the political turmoil.
As Sheikh Hasina, a democratically elected head of Bangladesh fled the country, Indian 'liberals' sought to instigate similar protests in India by casting aspersions on the country's democratic indicators.
The Delhi police have also increased security outside the Indira Gandhi International (IGI) Airport and the Bangladesh High Commission in Chanakyapuri.
Hindu minorities are being selectively targeted by Islamists under the garb of civil disobedience and non-cooperation with the Sheikh Hasina government.