Adani, whose home state is Gujarat in western India, built his business empire from scratch after starting as a commodities trader.
Adani's business empire grew rapidly and his wealth ballooned.
In recent years, the $220 billion Adani Group empire has attracted foreign investment - France's TotalEnergies (TTEF.PA), for example, partnered with Adani last year to develop the world's biggest green hydrogen ecosystem.
It is not known what was discussed and Adani Group did not respond to a request for comment on Friday.
Adani Group's consolidated gross debt stands at $23.34 billion, Jefferies says.