Covid claims two India Olympic hockey gold winners on same day
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Their families said they died hours apart on Saturday: Singh, 60, in the northern city of Lucknow and Kaushik, 66, later in New Delhi. Both had been on ventilators in hospitals.
India has been battling a huge surge in infections in recent weeks with new deaths passing 4,000 for the first time on Saturday.
Singh also played for India at the 1984 Olympics in Los Angeles, but retired because of chronic back injuries.
"His contribution to Indian sports will always be remembered," said Sports Minister Kiren Rijuju in a tribute.