"We have tweeted that the two leaders discussed a range of issues. A range of issues means a range of issues. I don't want to add anything further... I leave it to you to draw your conclusion," external affairs ministry spokesperson Gopal Baglay said.
The two-day G20 Summit saw the Indian side making "significant contributions" on resolve to counter terrorism and boost global trade and investment.
Mallya has been in the UK for months, escaping arrest warrants against him.
Arvind Panagariya, sherpa for India at the summit, tweeted about the "interaction".
The G20 leaders resolved to facilitate swift and targeted exchanges of information between intelligence, law enforcement and judicial authorities on operational information-sharing, preventive measures and criminal justice response.
Modi regretted that the international response to terrorism was weak and said more cooperation was needed to fight the menace.
Modi emphasised that it was necessary to work together for sustained global economic recovery.
A city like Davos in India would give a big boost to tourism, development, jobs and overall economy
Infosys chief Vishal Sikka also said that demonetisation has shown to the world that Indians are ready to adopt new technology disruptions.
According to Microsoft CEO Satya Nadella, data today shows that the world GDP growth is not "something great" and that calls for the need for new innovations like AI being taken very seriously.
Breaking his silence over the demonetisation issue, RBI Governor Urjit Patel on Sunday said the central bank is monitoring the situation on a daily basis and taking all necessary actions to "ease the genuine pain of citizens" with a clear intent to normalise the things as early as possible.
India must carry on structural reforms, the finance minister said.
Both countries have been working on administrative assistance.
Jaitley was speaking at a breakfast session.
Sikka dismissed that the new technology and connectivity would create imbalances.
As per the findings, CEOs are less optimistic about prospects this year.
India's ranking is worst among the five BRICS countries
Prime Minister Narendra Modi on Tuesday invited investors here to participate in the proposed divestment of Navratna PSUs
India and Singapore on Tuesday elevated their ties to the 'strategic partnership' level and signed bilateral agreements for enhanced defence cooperation and in areas like cyber security, shipping and civil aviation.
About 15 per cent of the country's total GDP comes from agriculture.