The BCCI plans to organize a couple of bilateral T20I series in the month of October. According to them, this initiative would help the Indian team to gear up for the T20 World Cup. The BCCI is in talks with South Africa and New Zealand in this regard.
The senior officials at BCCI said that both the teams from South Africa and New Zealand are scheduled to visit India in a couple of months (i.e. before the World Cup) and it would be the right time to finalize the modalities. The Board plans this event as it wants the Teams to be in touch with the format right before the World Cup begins.
As there was a series that was called off in March 2020 due to the pandemic, India and South Africa already have an agreement to play a series in India. But team India does not have any T20Is in line post the ongoing series that they are playing against England.
Team India is slated to travel to England for rge World Test Championship final and a five-Test series post the Indian Premier League. Team India would come back from England around mid-September. There are doubts about the Asia Cup as well as the PBC (i.e. Pakistan Cricket Board will host the remaining of the PSL (Pakistan Super League).
Insia is also supposed to host New Zealand for a Test series post the T20 World Cup. Then in the months of December and January, the Indian team will travel to South Africa for a full tour.