"Quinton announced his selection of the Easterns Titans as franchise of choice. We are delighted to welcome an international star of his class and undoubted potential," said Jacques Faul, chief executive of The Unlimited Titans and the Easterns Franchise.
"We believe he is a match-winning player who can change the complexion of an innings with his repertoire of attacking strokes."
He announced his arrival at international level in emphatic fashion in 2013 by bludgeoning three successive ODI-centuries on home soil against India.
Six tons in 44 ODIs at an average of 38.83 bears testimony to the class of the 22-year old left-hander.
Since making his test debut against Australia in Port Elizabeth in 2014, De Kock has also shown promising signs of maturity in this format and he has averaged 37.71 in white uniform.
A product of the King V11 school, a nursery that produced other international stars like Neil McKenzie and Graeme Smith, De Kock represented South Africa at u.19-level.
He made his senior debut against New Zealand in January 2013.
Following a quiet series against Sri Lanka, he blossomed against Pakistan in the United Arab Emirates.
In this series in October and November 2013, he blasted a magnificent 112 off 135 balls with nine fours and a six to propel the South Africans to a 28-run win in their fourth encounter in Abu Dhabi.
Since that performance, De Kock has not looked back. The belligerent opener has become an integral part of the Proteas' success, which has seen them move to number three on the ICC's list of one-day teams.
As a wicket-keeper, he has established himself as the first-choice behind the stumps for South Africa in all three formats. De Kock was particularly brilliant in that department in the Cricket World Cup.
His blinder to remove Kusal Perera proved to be a pivotal psychological moment in the quarter-finals against Sri Lanka.