India, currently 5th in world Test rankings, will have to make a clean sweep of the 3-match rubber to reach No. 2. However, this will also depend on the outcome of the 5th and final Ashes Test between England and Australia which begins at The Oval on August 20.
According to ICC's Test rankings' predictor, if India win 3-0 and the final Ashes Test ends in a draw or Australia win, then Virat Kohli-led side climbs to No. 2. The Ashes series would have ended 3-1 in favour of England.
A 2-1 win for India and 3-2 triumph for England in Ashes will keep Kohli's men at 5th position. However, if Sri Lanka whitewash India 3-0, then India will slip to No. 7.
At the moment, Sri Lanka are at 7th while Australia are No. 2. England are placed at 6th.
Latest ICC Test Team Rankings (as on August 10, 2015)
1. South Africa
4. New Zealand
7. Sri Lanka
8. West Indies