He reiterated the government's plan was to immunise 200 million to 250 million Indians by July.
An ICMR scientist told Reuters earlier this month the vaccine could be launched in February or March, although Bharat Biotech separately told Reuters on Friday that results of the late-stage trials were expected only between March and April.
Vardhan, however, said in September the government could opt for emergency vaccine authorisation, particularly for the elderly and people in high-risk workplaces.
Indian officials have said they expect to rely on COVAXIN and four other locally-tested candidates to control Covid-19, as they do not expect early access to sufficient quantities of those developed by Pfizer and Moderna.