The South African executive is concerned its nationals could also be operating as mercenaries in Nigeria inside the struggle against the Boko Haram militant team of workers.
Nigerian executive spokesman Mike Omeri steered the BBC that foreigners were merely training troops in the use of new weapons.
Nigeria has in recent years bought helicopter gunships and tanks from South Africa and former Soviet Union countries.
But the South African government says the men may be fascinated about fighting.
Nigeria and its neighbours have now not too way back recaptured quite a lot of towns and villages from Boko Haram, that may be allied to Islamic State (IS).
Thousands of other folks have been killed, so much recurrently in north-eastern Nigeria, making an allowance for that it began its insurgency in 2009.
Analysis by the use of Will Ross, BBC News, Lagos:
It is hard to explain why there had to be six years of carnage in north-east Nigeria in advance than the very important equipment used to be as soon as bought and aggressive, decisive movement used to be as soon as taken against Boko Haram.
But now the Nigerian executive are taking all of the lend a hand they can get and have finished a couple of good fortune against the jihadists. Whether we identify them mercenaries or military trainers, since the Nigerian government would prefer, the hired men from South Africa and the former Soviet Union are deployed inside the theatre of warfare and a couple of are armed.
Some were serving to show the Nigerian troops on the way to use the in recent years were given military equipment in conjunction with helicopter gunships, tanks and armoured cars. But the South African executive suspect that may be cover for illegal mercenary artwork.
For the Nigerian government, the issue of mercenaries is a gentle one and gives to the already tricky means of explaining why it ever was essential for the neighbouring armies of Chad, Niger and Cameroon to put in inside of Nigeria.
It is unlawful for South Africans to struggle in another country for private gain.
South Africa’s Defence Minister Nosiviwe Mapisa-Nqakula suggested the BBC that anybody suspected of fighting in Nigeria can also be investigated by the use of South African police.
No serving individuals of South Africa’s safeguard pressure were in Nigeria, the minister brought.
The presence of South African mercenaries was first steered thru a South African newspaper in January, and speculation intensified after a photograph circulated on Twitter ultimate week showing a white man in a khaki T-shirt and body armour, next to a heavy-calibre device gun.
The area of the photograph was later referred to as Maiduguri in north-east Nigeria, on the subject of the fighting with Boko Haram.
On Thursday, South African internet web sites steered that a mercenary from the country have been killed in an incident of delightful-fireside in Nigeria. Two anonymous belongings speaking to the French knowledge corporate AFP confirmed the incident.
The South African government has said the demise of no doubt considered one of its electorate in Nigeria, the New York Times tales.
“We are disturbed by the use of the dying of this one person,” defence spokeswoman Joy Peters knowledgeable the paper.
“Unfortunately, they went to Nigeria in their own personal capacity. We’d love to signify that this will serve as a warning to others who are taking into consideration sexy in such movements to in fact believe sparsely and believe the repercussions.”
Alongside South Africans, mercenaries from former Soviet Union global places are also steered to be taking part inside the fight.
In addition, not unusual soldiers from Chad, Niger and Cameroon have been operating with the Nigerian military to recapture towns and villages in north-east Nigeria that experience fallen under the regulate of the Islamist combatants.
Boko Haram at a glance:
- Founded in 2002, first of all enthusiastic about opposing Western-style coaching – Boko Haram way “Western coaching is forbidden” inside the Hausa language
- Launched military operations in 2009 to create an Islamic state
- Thousands killed, so much often in north-eastern Nigeria – has moreover attacked police and UN headquarters in capital, Abuja
- Abducted a lot, in conjunction with a minimum of two hundred schoolgirls
- Controls a variety of north-eastern towns
- Launched attacks on neighbouring states