In case of four retentions, it could be either three Indians and one foreign player or at the maximum two Indians and as many foreigners.
As things stand, the chances of franchises getting four players to retain are high with two new teams allowed to pick up to three players through a draft system before the auction begins.
Rajeev Shukla also hailed the 'wonderful achievement' of BCCI following the announcement of two new teams.
The IPL's first season was played in 2008, and ever since, the league has grown in stature and it is one of the most viewed competitions in the world.
The CSK skipper also said if any team deserved to win the IPL 2021 title it was KKR and also pointed out that the break helped the Eoin Morgan side.