New Delhi: India's Olympians have been warned to cover up at all times in Rio to minimise bites from mosquitos feared to carry the Zika virus, a senior official said yesterday.

"There are full sleeve T-shirts in the kit that will be provided to the players, who will be advised to wear covered clothing during their stay.

"There has been an advisory given by the IOC (International Olympic Committee) in which they have mentioned that we have to use a repellant with certain contents," said Indian Olympic Association chef de mission Rakesh Gupta.