He will also be the head coach of the Trinbago Knight Riders in the CPL.
McCullum has retired from all forms of cricket after the Global T20 Canada 2019.
The duo joined the Knights only last season.
Sandeep's sojourn has been a roller-coaster ride since he has topped wicket-getter charts for Kerala with 44 wickets last Ranji season.
Most of these cricketers have been exceptional for their IPL franchises and it is time for the Indian selectors to give them their due.
The KKR team management has seen quite a few changes of late.
Bayliss was part of the team, when it won the trophy in 2012 and 2014 respectively.
Saifuddin was one of the bright spots for the Tigers in the World Cup.
Kallis ended his nine-year stint with the franchise.
The Punjab youngster took to Twitter to inform the fans of his latest ride.