Not having Ishant will be a huge blow but I guess it will give someone else a chance. I don't mind the inclusion of Saini and Siraj as they both have been labelled red-ball bowlers. I still remember how good Siraj was bowling for India A team in four-day matches and still wasn't given a chance back in 2017-18. Even though he doesn't do well in T20 format, his bowling was exciting to watch in today's game.
I also read somewhere that Hardik Pandya is unlikely to get picked for test matches since his body can't take it right now. Well then stop him from playing in the IPL and get him ready for test cricket. We will need a fifth bowling option on those flat Australian wickets where playing two spinners might be a risk.