Cricket South Africa (CSA) Director of Cricket Graeme Smith will take a knee to show his support to the "Black Lives Matter" movement at Saturday's Solidarity Cup match at SuperSport Park, Centurion.
The letter commended current fast bowler Lungi Ngidi, who last week expressed support for the Black Lives Matter movement.
Lungi Ngidi said he believed his South Africa team-mates should make a stand the next time the squad meets but Pat Symcox and Boeta Dippenaar were among those criticised him.
Cricket South Africa Acting Chief Executive Jacques Faul praisd Quinton de Kock and Laura Wolvaardt, saying that they have both set the highest standards.
Janneman Malan hit a match-winning century against Australia as South Africa clinched the ODI series with a game to spare.
Lungi Ngidi has been ruled out of the Boxing Day Test against England after he suffered a Grade 1 hamstring muscle tear during warm-ups ahead of the Mzansi Super League play-offs.
Lungi Ngidi is not new to the "Lungi Dance" song, having come across it when playing for Chennai Super Kings.
Lungi Ngidi, after passing the fitness test, is likely to replace Beuran Hendricks for South Africa.
South Africa will look to avenge their semi-final loss at the previous World Cup that saw them once again going down in a knockout game in an ICC tournament.
Lungi Ngidi's return will bolster South Africa's pace attack after veteran pacer Dale Steyn was ruled out of the tournament. With three points in five games, South Africa still have an outside chance to make it to the semi-finals.
South Africa pacer Lungi Ngidi will be sidelined for up to 10 days after suffering a hamstring strain in Sunday's World Cup defeat to Bangladesh.
Scott Kuggeleijn has featured in two One-Day Internationals (ODI) and four T20 Internationals for New Zealand.
This is South Africa's last 50-over assignment before the ICC World Cup 2019, starting on May 30 in the United Kingdom.
Lungi Ngidi sustained a right knee ligament injury while fielding in a T20 international against Australia last week.
Both Dale Steyn and Lungi Ngidi shared four wickets between them while Andile Phehlukwayo ended the match with figures of 3/33.
Dale Steyn, 35, was named in the 15-man squad which includes young stars Kagiso Rabada and Lungi Ngidi.
Chasing 118, South Africa lost their first four wickets for 58 runs but Heinrich Klaasen dashed Zimbabwean hopes.