India must start planning for Rohit Sharma's successor if the team do not play well in their five-Test series in Australia as the captain could well retire from the longest format, former skipper Krishnamachari Srikkanth has said. India head to Australia needing to win four out of their five Tests to reach a third successive World Test Championship final next year and could be without Rohit for the opener in Perth starting on Nov 22 for personal reasons. If Rohit Sharma doesn't do well, I think he himself will retire from test cricket, for all you know," Srikkanth said on his YouTube channel. Rohit has scored 4,270 runs in test cricket at an average of 42.27 but his recent form has come under the microscope. Srikkanth, also a former chief selector, said the skipper was right to accept his shortcomings in a press conference.