What are the implications of Shreyas Iyer's back injury for the Indian cricket team?

 Weak middle order.

Iyer has been the best middle order batsmen, India has in the recent years.

In fact he has been the best ODI batter of India in 2022, with amassing the most runs for India in that format.

However it is only a spasm and not a serious injury to worry about, we might see him in the next ICT match most probably.