Saini and Mumbai's Shardul Thakur have been called up to the Indian team ahead of the third Test in Johannesburg on January 24. The visitors have already lost the series after going down comprehensively in the first two matches in Cape Town and Centurion.
"Saini's inclusion is important because it is in keeping with the rotation and intended experimentation in the pace department," a team source said.
Saini took over 30 wickets in a sensational Ranji season, the highlight of which was him running through a strong Bengal line-up in the semifinals.
India will get down to practice on Sunday for the final match of the series.
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It is in keeping with what the team management had done earlier, including the likes of Mohammed Siraj, Ankit Rajpoot and Basil Thampi to bowl in the nets ahead of this Test series.
It is to be noted that Thakur is already part of the limited-overs squad that will be arriving here later in January with the first ODI to be played in Durban on February 1.
Saini's inclusion though is eye-catching. He had been part of the management's plans to arrive here with the previous group, but had stayed back to help Delhi finish runners-up in the Ranji Trophy.
"It is in keeping with team policy to get some experience of conditions. So Thakur's early arrival will help him get acclimatized quickly ahead of the ODI series," said a team source here.
With a green pitch in the offing, with a lot of pace and bounce, the management doesn't want to rely on local net bowlers who "might not be upto the mark" to help in this endeavour.