Speedster Navdeep Saini also found a place in the list of three back-ups for the mega-event starting on May 30.
Pant and Rayudu's exclusion from the squad of 15 had created quite a stir on Monday. While Sunil Gavaskar called Pant's omission surprising, the snub to Rayudu was questioned by Gautam Gambhir.
With the ICC doing away with the practice of letting countries announce a probables' list before the final squad, the BCCI also has the option of including anyone apart from these three but it is unlikely to happen.
"Just like ICC Champions Trophy, we have three standbys. Rishabh Pant and Ambati Rayudu are the first and second standbys while Saini is the bowler in the list. So if anyone gets injured, as per requirement, one of the three will be going," mews agency PTI quoted senior BCCI official on Wednesday.
While Khaleel Ahmed, Avesh Khan and Deepak Chahar will be travelling with the team purely as net bowlers, they can also be drafted in if the management feels so.
"Khaleel, Avesh and Deepak are not designated standbys. In case of bowlers, that possibility is there but when it comes purely to batsmen, it will be either Rishabh or Rayudu," the official said.