The Black Stars have been in closed training sessions since they arrived on Monday as they plan strategically for their opponents.
But Ghana will train in front of its own World Cup fans for the first time to give the fans and Ghanaians living in South Africa to see the team at first hand.
Fans in Pretoria and surrounding towns and cities like Johannesburg are expected to to troop to their training ground to watch the Black Stars.
Some Ghanaians living in Pretoria including property investor Mr Oduro and Michael Bonsu, the son of sports administrator Kojo Bonsu, were seen in frantic talks with Ghana FA members about the planned open day.
Ghanaian kids in the southern African country are also expected to attend the open day and to get the chance to see the Black Stars players at first hand.
This measure is aimed at boosting support from native South Africans and Ghanaians for the Black Stars during their matches in the tournament.
The Black Stars will start training at 4pm local time on Wednesday.