Ahead of the upcoming IPL, the names of 173 players including 10 franchises have already been announced. So in view of the upcoming IPL, the Indian players may not be going to the South Africa tour, especially the old players, Rohit Sharma and Virat Kohli. There is no other reason than that Rohit Sharma needs some rest after the upcoming IPL and the recently concluded ODI World Cup. That is why old players are not seen in foreign tours and currently in T20 series.
Therefore, in the T20 series against Australia, the players who played in the World Cup are not seen in the Indian team. Going on a tour to another country right after the World Cup will definitely cause fatigue for these players. One reason could be to give the senior players a chance to rest and the other reason is that India is not short of star players, India has a lot of talent so they always have replacement players ready.
Therefore, even in the absence of senior players against Australia, India has defeated Australia in the first two T20 matches. Seeing the popularity of IPL, all the players want to participate in IPL and show their best performance, but I think it is better to play for the country than to play for yourself, so Indian Senior players must join foreign tours.