He has previously represented the Renegades five years ago.
Michael Klinger is the all-time leading scorer of BBL.
The Sixers, meanwhile, released wicketkeeper Peter Nevill to make room for Smith in the team.
Three experienced South Africans in the list.
(Note: Though BBL 2019-20 starts from December 17th and IPL Auction takes place on December 19th, franchises can pick the BBL stars later as well as injury replacements)
Dale Steyn is all set to make his debut in the BBL.
Banton will play first 8 league matches for Heat.
Steyn last featured in any game across formats in the IPL while playing for RCB.
Alex Hales has signed a one-year deal and will join Chris Morris as the second overseas player with the side.
It will be Mujeeb's second stint with the franchise after he got 12 wickets last season.