India's market regulator has asked stock exchanges to be ready to begin trading on Friday but will take a final call on resumption just before the starting time.
"We have asked the exchanges to be ready to start trading," CB Bhave, chairman of Securities and Exchange Board of India, told Reuters.
"We have kept our options open, we will take a final call later. No time has been fixed for the decision," he said.
India's stock markets were closed on Thursday after a terror attack on Mumbai, India's financial capital.
The stock market usually begins trading at 9:55 am (0425 GMT).