Sounds like a tactical injury to me, indian management has a history of not using word " dropped" and instead they deflect any potential questioning by announcing injuries and most of the times planting a stories in media.
Anyways, surely they have no confidence on krishna hence they are calling up kamboj as new addition in the squad.
there were reports on Nair and then injury report on Reddy and Akash, if everything is true then 3 changes in the playing XI, don't know who will replace them. Maybe kulli and kamboj as pure bowler, Jurel as batter can make it. Another gamble would be Washi batting at number 3, just to test him.
These three are confirmed to be dropped from the XI:
1. Karun Nair
2. Akash Deep
3. Nitish Kumar Reddy
And these will be the replacements (IMO):
1. Sai Sudarshan
2. Shardul Thakur
3. Dhruv Jurel
Don't think that they will go for Kuldeep, given the conditions that are not supportive of spin. And in case Sai Sudarshan is included in the XI, then I don't think that Washington can be promoted to no.3. Bad news for Abhimanyu Easwaran. Still he can't find place in the XI.