South Africa captain Faf du Plessis indicated that a decision is not entirely imminent, and will need board approval, but he revealed he has already taken the trouble to sound out members of Joe Root's team about Gibson's suitability - and has been encouraged by their response.
Gibson helped to win the World Twenty20 with West Indies in 2012 and was also in charge for their semi-final defeat to Sri Lanka in defence of their title two years later.
If he does take the South Africa job, it will leave England looking for a new bowling coach ahead of the Ashes tour. "We will not listen to any approaches until after the current series has concluded", the European Central Bank said in a statement. But at the moment Russell Domingo is head coach of South Africa and doing a brilliant job and it would be disrespectful of us to talk about his position all the time he's in it. Richard Johnson, the former England seamer who now works as bowling coach at Middlesex, is likely to be a leading contender, while Graeme Welch, currently with Leicestershire, is another option.
Gibson, who is now contracted to the European Central Bank as a bowling coach, spent time in South Africa as a player turning out for Gauteng and Border.
Russell Domingo's contract runs out at the end of this season and the position was advertised by Cricket South Africa (CSA) with Domingo reapplying for the role.
England assistant coach Paul Farbrace was surprised by the news saying: "Ottis is someone who has obviously had a lot of global experience". I'm at a loss at the moment, whether it's a go-ahead, we haven't heard for sure. It is understood that both sides considered it appropriate to progress only after the end of the series.
As for Gibson's move from England to South Africa, it is likely to happen sooner or later as England play next against West Indies later this month while South Africa will be hosting Bangladesh next month.