Nilekani, 62, one of Infosys' seven founders and also a former CEO, said he wants to put the company on "the right stable path" and "ensure there are no discordant voices in the company and everyone is on the same page".
Nilekani has been called in to steer Infosys after chairman R Seshasayee and three other directors quit, meeting the key demand of founder group led by N R Narayana Murthy.
At that time, the board criticised Murthy, who in the following days moved swiftly to get investors as well as other founders to back him.
"I have come in to focus on the future of the company, I have come in to take the company forward and deal with its challenges," he said in an investor call arranged within hours of his appointment.
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"I plan to be here as long as necessary and work as hard as necessary," he said.
With revenue rising four-fold to USD 2 billion under his watch, Nilekani left Infosys in 2009 to shape the world's biggest biometric ID programme, Aadhaar.
Stating that he has no intention to become CEO of the company, he said the future strategy of Infosys will be aligned with global developments and he sees tremendous opportunity in software data and machine learning.
"I will focus my attention on the future of the business and customer needs, and show demonstrable progress," he added.
Nilekani promised to offer more details of the strategy in October and is focussed on bringing "complete stability".
About the founders, he said he was an "admirer" of Murthy and "will ensure Infosys, Murthy and other founders have a healthy relationship".
"I will ensure there are no discordant voices in the company and everyone is on the same page," he asserted.
"Many good practices (of corporate governance) including full disclosures and transparency, SEC filings... Were spearheaded by Infosys," he pointed out.
Nilekani made it clear that as the non-Executive Chairman, his role will be oversight, governance and functioning and to help with the CEO search that will include internal and external candidates as well as Infosys "alumni".
He emphasised that he will stay as long as necessary, but declined to put a timeline to his latest stint. Finding a new CEO soon and reconstituting the board will be parallel activities, Nilekani pointed out.