"Jacques Kallis has been an integral part of the KKR family & will always remain so. We will be exploring ways of working with Jacques as we pursue our vision of establishing the Knight Rider brand as a global brand," KKR CEO Venky Mysore was quoted by the team's website.
Kallis joined the side in 2011 as a player before replacing Trevor Bayliss as head coach in October 2015.
"After nine fantastic years with KKR since 2011, as a player, mentor and head coach, it’s time to explore new opportunities. I would to like to thank the Owners, Management and fellow players for many happy memories," Kallis said.
Under Kallis and Katich, KKR won 32 of their 61 games.